while many animal species were domesticated in the post-pleistocene in the old world, very few animals were domesticated in the americas. in south america, the most significant were the:group of answer choices

Answer:mrna Serves as intermediary between DNA and protein; used by ribosome to direct synthesis of protein it encodes

Trna Carries the correct amino acid to the site of protein synthesis in the ribosome

Explanation:

Answer:

through changes in the availability or activity of the "helper"

Explanation:

This process involves many "helper" proteins, which make sure the ribosome is correctly positioned. Translation can be regulated globally (for every mRNA in the cell) proteins.

Answer:

The DNA is packed into chromosomes. The DNA replication is the same as mitosis. And after the DNA is replicated, the homologous will double, and now each chromosome now has a homologous pair

Explanation:

Answer:

When does puberty start? Puberty starts when changes in your child's brain cause sex hormones to start being released from the gonads, which are the ovaries and testes. This typically happens around 10-11 years for girls and around 11-12 years for boys.Skip

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What is puberty?

Puberty is the time when your child moves through a series of significant, natural and healthy changes. These physical, psychological and emotional changes are a sign that your child is moving from childhood towards adulthood.

Changes in puberty include:

physical growth and development inside and outside children’s bodies

changes to children’s sexual organs

brain changes

social and emotional changes.

When does puberty start?

Puberty starts when changes in your child’s brain cause sex hormones to start being released from the gonads, which are the ovaries and testes.

This typically happens around 10-11 years for girls and around 11-12 years for boys.

But it’s normal for the start of puberty to range from 8-13 years in girls and 9-14 years in boys.

There’s no way of knowing exactly when your child will start puberty. Early changes in your child’s brain and hormone levels can’t be seen from the outside, so it’s easy to think that puberty hasn’t started.

Puberty can be completed in about 18 months, or it can take up to 5 years. This range is also completely normal.

Girls: key physical changes in puberty

In girls, these are the main external physical changes in puberty that you can expect.

Around 10-11 years

Breasts will start developing. This is the first visible sign that puberty is starting. It’s normal for the left and right breasts to grow at different speeds. It’s also common for the breasts to be a bit tender as they develop. If your child wants a bra, a soft crop top or sports bra can be a good first choice.

A growth spurt occurs. Some parts of the body – like the head, face and hands – might grow faster than limbs and torso. This might result in your child looking out of proportion for a while. On average, girls grow 5-20 cm. They usually stop growing at around 16-17 years.

The body shape will change. For example, a girl’s hips will widen.

The external genitals (vulva) and pubic hair will start to grow. Pubic hair will get darker and thicker over time.

Around 12-14 years (about two years after breast development starts)

Hair will start growing under the arms.

A clear or white discharge from the vagina starts several months before periods start. If the discharge bothers your child, you could suggest your child uses a panty liner. If your child says it’s itchy, painful or smelly, consult your GP.

Periods will usually start within 2 years of breast growth starting, but can take up to 4 years.

Boys: key physical changes in puberty

In boys, these are the main external physical changes in puberty that you can expect.

Around 11-12 years

The external genitals (penis, testes and scrotum) will start to grow. It’s normal for one testis to grow faster than the other. You can reassure your child that men’s testes usually aren’t the same size.

Pubic hair will start to grow. It will get darker and thicker over time.

Around 12-14 years

Your child will have a growth spurt. Your child will get taller and their chest and shoulders will get broader. Some parts of your child’s body – like their head, face and hands – might grow faster than their limbs and torso. This might result in your child looking out of proportion for a while. On average, boys grow 10-30 cm. They usually stop growing at around 18-20 years.

It’s common for boys to have minor breast development. If your child is worried by this, it might help your child to know it’s normal and usually goes away by itself. If it doesn’t go away or if the breasts seem to be growing a lot, consult your GP.

Around 13-15 years

Hair will start growing on other parts of your child’s body – under the arms, on the face and on the rest of the body. Leg and arm hair will thicken. Some young men will grow more body hair into their early 20s.

The hormone testosterone is produced, which stimulates the testes to produce sperm.

Your child might start having erections and ejaculating (releasing sperm). During this period, erections often happen for no reason at all. Just let your child know that this is normal and that people don’t usually notice. Ejaculation during sleep is often called a ‘wet dream’.

Around 14-15 years

The larynx (‘Adam’s apple’ or voice box) will become more obvious. Your child’s larynx will get larger and their voice will ‘break’, eventually becoming deeper. Some boys’ voices move from high to low and back again, even in one sentence.

Answer:

For girls, puberty typically occurs between the ages of nine and thirteen

For boys, puberty typically occurs between the ages of ten and fifteen.

An increase in hormones – estrogen and progesterone in girls and testosterone in boys – causes the changes that happen during puberty.

Explanation:

Answer:

C

Explanation:

incomplete dominance

Answer:

the sympathetic nervous system

Explanation:

Answer:

Eccentric muscle contraction is muscle lengthening as the muscle produces tension and the insertion moves away from the origin.

pls brinley meeeeeeeeeee

Answer:

Thanks

Explanation:

Answer:

A concentration gradient must exist.

Explanation:

For diffusion to occur, a concentration gradient must exist. Therefore, the correct option is A.

The movement of molecules along a concentration gradient is known as diffusion. It is a significant process that all living things go through. Diffusion facilitates the flow of materials into and out of cells.

Without the use of energy, molecules can be transported from an area of high concentration to an area of low concentration through the process of diffusion. Simple diffusion and Complex diffusion are the two types of diffusion. Diffusion was made easier.

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The progeny from the cross between a female with circular nostrils and a straight tail and a male with limited nostrils and a wavy tail displayed a Mendelian inheritance pattern for the two characteristics, showing autonomous grouping and taking after Mendel's laws of segregation and independent assortment. Hence, all the options are correct.

The given cross includes two characteristics in Zukai turtles: nostril shape (circular or contract) and tail shape (straight or wavy). In this case, circular nostrils (A-genotype) and straight tails (B-genotype) are prevailing over contract nostrils (aa genotype) and wavy tails (bb genotype), individually.

The female parent within the cross has the genotype AaBb (circular nostrils, straight tail), whereas the male parent has the genotype aabb (contract nostrils, wavy tail).

When these two people are crossed, the resulting progeny appear in a 1:1 proportion for each characteristic combination. The observed progeny checks of 25 people for each characteristic combination (circular nostrils and wavy tail, contract nostrils and straight tail, circular nostrils and straight tail, contract nostrils, and wavy tail) coordinate the anticipated Mendelian proportions.

This illustrates the free combination of the two characteristics and takes after the segregation and independent assortment. proposed by Gregor Mendel in his tests with pea plants.

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Answer:

A duck's foot is webbed and the chicken's foot is not

Explanation:

The difference is due to apoptosis.Ducks have webbed feet because the cells between their toes do not undergo apoptosis

Apoptosis is a form of programmed cell death. It is the result of the self-destruction mechanisms that is started when the cells respond to a certain stimulus that leads to the destruction of the cell.

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Answer:

D

Explanation:

Nitrogenous bases present in the DNA can be grouped into two categories: purines (Adenine (A) and Guanine (G)), and pyrimidine (Cytosine (C) and Thymine (T)). These nitrogenous bases are attached to C1' of deoxyribose through a glycosidic bond.

A state of joyful activity in which the subject performs an action effortlessly and skillfully is known as a flow state.

Flow state, popularized by positive psychologists Mihaly Csikszentmihalyi and Jeanne Nakamura, defines a state in which you get completely involved in whatever you are doing given the correct conditions.

When you commit your full attention to an activity or work that you are immensely passionate about, utterly focused on, and completely involved in, you may find yourself establishing the circumstances for experiencing a flow state of mind.

The mind's regular chatter begins to fade, placing us in a state of non-distraction. Under normal conditions, the sensations that might overwhelm you (inhibition, hunger, exhaustion, or aches and pains) go away, and all that counts is your devotion to your craft.

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Currently, the District of Columbia and 45 states are in the process of licensing the massage-therapy profession.

The correct option is B.

Massage therapy is a hands-on approach to manual therapy that involves manipulating the soft tissues of the body, such as muscles, tendons, ligaments, and fascia, to improve physical and mental health.

The therapist uses various techniques, including pressure, kneading, rubbing, and vibration, to alleviate pain, reduce tension and stiffness, improve circulation, and promote relaxation.

Massage therapy is regulated in the District of Columbia, and practitioners must obtain a license from the Department of Health's Board of Massage Therapy to practice legally.

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Answer:

A person with diabetes needs to watch how much sugar they eat because eating too much sugar can make their condition or symptoms worse which makes even more difficult for their body to manage blood sugar levels.

Explanation:

This still is the same for people with type 1 diabetes

Answer:

1) anti - B

2) anti - A

3) -----------

4) anti - A and anti - B

Answer:

B

Explanation:

As you read the article you`ll understand that Darwin discovered that the finches were all different because of the genetic code.

I just finished the test

Answer:

Food source​

Explanation:

Each bird ate different foods, bigger beaks>nut diet smaller>insects

The statement that is NOT true about all chordates is:

D. They have a vertebral column.

While chordates are characterized by certain features such as having a notochord (either during development or throughout life), the presence of a vertebral column is not a universal characteristic of all chordates. In fact, not all chordates possess a vertebral column.

Some chordates, such as the tunicates (sea squirts) and lancelets, do not have a true vertebral column but instead have a notochord that provides structural support. The presence of a vertebral column is a defining feature of the subphylum Vertebrata, which includes organisms like fish, amphibians, reptiles, birds, and mammals.

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Answer:

The enzyme inhibitor fits into the enzyme's active site, which prevents the enzyme from catalyzing the reaction.

Explanation:

Answer: The enzyme inhibitor fits into the enzyme's active site, which prevents the enzyme from catalyzing the reaction.

Explanation:

Answer:

True

explaination non

Genotypic variance, environmental variance, broad-sense heritability, and leaf number are all important terms to consider when looking at a cross between two cultivated inbred varieties of tobacco. In this particular case, the variance in leaf number per plant is 1.46 in the F1 generation and 5.97 in the F2 generation.

The genotypic variance is the variation in the trait due to the variation of alleles. This can be determined by comparing the phenotypes of the F2 generation and the variation between them. The environmental variance is the variation that arises from the differences in the environment between individuals, such as temperature, light, etc. This can be determined by comparing the F1 and F2 generations.

The broad-sense heritability of a trait is the proportion of the total variance in the trait due to the genotypic variance. This can be calculated by dividing the genotypic variance by the total variance. In the case of leaf number, the broad-sense heritability is equal to the genotypic variance divided by the sum of the genotypic variance and environmental variance.

In conclusion, the genotypic variance in leaf number per plant is 1.46 in the F1 generation and 5.97 in the F2 generation. The environmental variance can be determined by comparing the F1 and F2 generations. The broad-sense heritability of leaf number is equal to the genotypic variance divided by the sum of the genotypic variance and environmental variance.

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Answer:

Latitude is distance between earth and equator. The temperature decrease by  degree for every 100 meters latitude.

Explanation:

Latitude is the distance between earth and equator. The lower the latitude there will be higher temperature. When latitude increase the temperature began to fall. The equator is the potion of earth where sun rays directly strike which makes feel hotter. The temperature gets cooler when it approaches the poles. There can be slight variations in the climate throughout the year. The places away from latitude are colder and receives less sunlight.

Visual representations provide clear overview, organize information, and illustrate complex data for better understanding and memory.

Visual portrayals, like timetables, can help in grasping complex logical ideas and data in more ways than one. They, first and foremost, can give an unmistakable and compact outline of a mind boggling subject, making it more clear the connections between various occasions and ideas. For instance, a timetable of the historical backdrop of the universe can assist with representing the succession of significant occasions, like the development of stars and systems, the improvement of life on The planet, and the development of people.Besides, visual portrayals can assist with sorting out data in a manner that is straightforward and recall. For example, a timetable of the phases of mitosis can assist understudies with envisioning and figure out the course of cell division.At long last, visual portrayals can be utilized to outline complex information and connections, making it simpler to distinguish examples and reach inferences. For instance, a course of events of environmental change information can assist with showing how worldwide temperatures have varied after some time and the expected effect of human exercises on the climate. In general, visual portrayals are an integral asset for science schooling, assisting with imparting complex data in an open and connecting way.

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The term "geological processes" refers to the natural factors that alter Earth's shape. The Earth's surface is impacted by a number of geological processes, such as erosion, sedimentation, and chemical weathering.

Geological processes is defined as the geological events that take place across timescales of millions of years, hundreds of meters, and thousands of kilometers.

It can also be defined as dynamic activities or events that take place on the surface of the Earth as a result of the impact of natural factors like as wind, moving water, ice, and snow, temperature changes, freezing and thawing, chemical reactions, seismic shaking, and the application of gravity.

Thus, the term "geological processes" refers to the natural factors that alter Earth's shape. The Earth's surface is impacted by a number of geological processes, such as erosion, sedimentation, and chemical weathering.

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a.) Warming the extraction buffer and tissue sample helps to facilitate the breakdown of cell membranes and release of DNA from the nucleus. The heat helps to disrupt the bonds between the DNA and proteins, making it easier for the DNA to be extracted.

b.) Guanine hydrochloride is a salt that is often added to DNA extraction buffers to aid in the purification of DNA. It helps to remove contaminants and other unwanted substances from the sample, leaving only the DNA behind.

c.) 95% ethanol is added to the DNA sample to help precipitate the DNA out of solution. DNA is not soluble in ethanol, so when it is added to the sample, the DNA molecules will clump together and become visible as a white, stringy material. This allows the DNA to be easily collected and purified for use in further experiments.

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Answer:

Punnett squares are used today as a tool to predict the probability of certain traits being expressed in offspring. They are named after the scientist Reginald Punnett, who invented them in the early 20th century. The Punnett square works by organizing the alleles (different forms of a gene) from the parents into a grid. Each parent's alleles are placed along the top and left side of the grid. Then, every combination of alleles is shown in the boxes inside the grid. For example, if one parent has the alleles Aa and the other parent has the alleles aa, the grid would look like this: | a | a --|---|--- A |Aa | Aa --|---|--- a |aa | aa In this case, the offspring have a 50% chance of inheriting the dominant A allele and a

0 / 350

Explanation:

animal, plant, fungi, protist and moner

Explanation:

Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.

Polio is an acute enteroviral infection of the spinal cord that can cause neuromuscular paralysis.

It can cause a range of symptoms, from mild flu-like symptoms to more severe cases that can lead to paralysis, including muscle weakness or complete loss of muscle function. While polio has been largely eradicated in most parts of the world due to widespread vaccination efforts, it remains a significant health concern in some regions. The disease is preventable through vaccination, and global efforts to eradicate the virus have been successful in reducing the number of cases worldwide.

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Answer:by rotation that is powered by the motive force

Explanation: