Mice belonging to the genus Mus bred for use in research are regulated through PHS policy but are NOT covered by the Animal Welfare Act. T/F

Answer:

Disorders of chromosome number include the duplication or loss of entire chromosomes, as well as changes in the number of complete sets of chromosomes. They are caused by nondisjunction, which occurs when pairs of homologous chromosomes or sister chromatids fail to separate during meiosis.

Explanation:

Some form of early Homo is estimated to have evolved into Homo erectus around 1.7-2 million years ago, option B is correct.

Homo erectus is believed to have evolved around 1.7-2 million years ago based on fossil evidence and dating methods. Fossil discoveries, such as the famous Nariokotome Boy skeleton found in Kenya, provide crucial insights into the anatomy and characteristics of Homo erectus. These fossils, along with other archaeological and genetic evidence, suggest that Homo erectus was the first hominin species to exhibit significant anatomical and behavioral differences from earlier hominins.

The emergence of Homo erectus marked a significant milestone in human evolution, as this species had a larger brain size, more advanced tool-making abilities, and potentially even the ability to control fire. These developments laid the foundation for the subsequent evolution of Homo sapiens, option B is correct.

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The complete question is:

Some form of early Homo is estimated to have evolved into Homo erectus around:

A) 5-7.5 million years ago

B) 1.7-2 million years ago

C) 10,000-40,000 years ago

D) 50,000-70,000 years ago

Answer:

Gibberellin

Explanation:

I've studied that gibberellin is a plant hormone that promotes cell elongation and division, causing the cells in the leaves to elongate and divide more, this leads to an increase in leaf size.

Hope it helps! :)

The plant hormone that helps in increasing the leaf size is the phytohormone Auxin .

Plants create signalling molecules called plant hormones, which are found in low concentration. All  plant's growth and progression are regulated by plant hormones.

There are basically five types of plant hormones that are considered to be essential for plant growth . They are Auxin , Cytokinin , Gibberellin , ABA , Ethylene .

The Cytokinin and Auxin work together to enhance the development of leaf as both of the phytohormones are responsible to modulate the growth of leaf as well  as controlling the cell cycle . These hormones are considered essential for plant growth and it occur naturally at various concentrations within plants throughout the duration .

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Answer:

The correct answer is - cholesterol molecules.

Explanation:

Cholesterol molecules are the molecules that acts as a bidirectional regulator for the lipid bilayer as it provides fluidity by raising the melting point of the membrane at high temperature and stabilize the membrane.

On the other hand, it also prevents the membrane from clustering or being tough or stiff by intercalates between the phospholipids at low temperatures. Therefore it is the molecule that provides stability to the membrane.

Answer:

During pregnancy, the fetus gets its oxygen and nutrients from the mother through the placenta, a specialized organ that connects to the uterus. The placenta consists of the chorionic plate on the fetal side and the basal plate on the maternal side, which is embedded in the endometrium, the inner lining of the uterus. The myometrium, the muscular layer of the uterus, contracts and relaxes during labor, pushing the fetus out of the uterus and into the birth canal.

The placenta is connected to the mother's circulatory system through the uterine arteries and uterine veins, which deliver deoxygenated blood to the placenta and carry away oxygenated blood from the placenta. The fetus is connected to the placenta through the umbilical cord, which contains the umbilical arteries and the umbilical vein, surrounded by a protective layer of Wharton's jelly. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, while the umbilical vein carries oxygenated blood from the placenta to the fetus.

The placenta acts as a barrier, preventing the mother's blood and the fetus's blood from mixing but allowing oxygen, nutrients, and waste products to be exchanged between the two. Oxygen and nutrients from the mother's blood diffuse across the placental membrane and into the fetal blood, providing the fetus with the necessary nourishment for growth and development.

The fetus rids its wastes by transferring them across the placenta into the mother's blood. The mother's kidneys filter out the waste products, such as urea and carbon dioxide, from her blood, which are then excreted from her body. The fetus also releases waste products into the amniotic fluid, a clear liquid that surrounds the fetus in the amniotic sac. The amniotic fluid serves as a cushion, protecting the fetus from external impacts and temperature fluctuations.

Placenta previa is a condition in which the placenta covers part or all of the cervix, which can cause bleeding and complications during delivery. In some cases, a cesarean section may be required to deliver the baby safely.

Answer:

The fetus gets its oxygen and nutrients through the placenta, which is an organ that develops in the uterus during pregnancy. The placenta is attached to the chorionic plate and the Basel plate, which are parts of the fetal membrane that lines the uterus. The placenta is also connected to the fetus by the umbilical cord, which contains the umbilical arteries and umbilical vein. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, while the umbilical vein carries oxygenated blood from the placenta to the fetus. The placenta is supplied with oxygen and nutrients from the mother's blood through the uterine artery and uterine veins that are in the endometrium and myometrium of the uterus. The mother's blood and the fetal blood do not mix. The wastes produced by the fetus are removed by the mother's blood through the placenta. The amniotic fluid that surrounds the fetus provides a protective environment for the fetus, and it is constantly replenished by the fetus swallowing and urinating. Placenta previa is a condition where the placenta covers part or all of the cervix, which can lead to bleeding during pregnancy.

Answer:

B

Explanation:

Ms,Biswas made me do this mate (PAIN)

Answer:

B - Carbon normally has four covalent bonds.

Explanation:

Answer:

c sorry if wrong

Explanation:

Answer:

D

Explanation:

The moon does not move further away, so it's not a. B is close but not quite. C is just stupid. So you are left with D, which makes sense because the moon rotated to face the sun differently, so you could only see half of the moon from the earth.

Honeybee health is influenced by a combination of factors, including nutrition, pesticides, and parasites. The correct option is all of these.

Proper nutrition is essential for honeybees to maintain their immune system and perform vital tasks within the colony. A diverse diet of nectar and pollen from various plants helps ensure they receive all necessary nutrients.

Pesticides can harm honeybees by directly causing acute toxicity or through sublethal effects that impair their ability to forage, navigate, and reproduce. Exposure to pesticides can occur when bees visit treated plants or collect contaminated pollen and nectar.

Parasites, such as the Varroa destructor mite, are a significant threat to honeybee colonies. These mites weaken the bees by feeding on their hemolymph and transmitting viruses, leading to the collapse of the colony.

In conclusion, honeybee health is affected by a combination of factors, including nutrition, pesticides, and parasites. Ensuring a diverse and healthy environment for bees to forage, along with careful management of pesticide use and parasite control, can help support the well-being of honeybee populations. Hence, all of these is the correct option.

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The spinal cord, which is part of the central nervous system, acts reflexively, sending and receiving signals with little to no conscious effort.

The central nervous system (CNS) is a complex network of nerves and cells that run throughout the body. It includes the brain and spinal cord.

These two important organs work together to receive and interpret messages from other parts of the body. They also work together to send signals to the rest of the body, so that it can respond appropriately to different stimuli.

The brain and spinal cord are connected by a system of nerves that transmit information between them. This system of nerves is called the peripheral nervous system. It includes all the nerves that branch out from the brain and spinal cord to other parts of the body.

The spinal cord is a long, thin, tubular structure that extends from the base of the brain to the lower back. It acts as a kind of relay station between the brain and the rest of the body.

It is responsible for sending and receiving signals between the brain and different parts of the body, such as the arms and legs. When a person experiences a painful stimulus, such as a hot stove, the sensory neurons in the skin send a signal to the spinal cord.

The spinal cord then sends a signal back to the muscles in the arm to move the hand away from the hot stove. This reflexive action happens automatically, with little or no conscious effort on the part of the person.

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Answer:

The answer is A.

Explanation:

A marine biologist is likely to find most Prochlorococcus organisms in the sunlight zone of the ocean, which is also called the euphotic zone. This zone is characterized by abundant sunlight, which is necessary for photosynthesis to occur.

your a complete diputs head are you thats so easy bro

Answer:

Nutrient

Explanation:

All the chemical substances that an organism needs to sustain life are its nutrients. Every living organism needs nutrients to build tissues and carry out essential life functions. Similar to water, nutrients are passed between organisms and the environment through biogeochemical cycles.

Answer:

d

Explanation:

nucleic acid is present in nucleus

not cell membrane

Answer:

Proteins

Explanation:

Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs.

Answer:

Eukaryotic cells contain organelles and DNA enclosed within a nucleus and prokaryotic cells do not.

Explanation:

eukaryotic cells have a nuclius, prokaryotic cells don't.

There is no fixed standard for determining the highest longitude. Different people have different ideas of what that should be. But the Earth’s highest longitude is believed to be 90°E (east) in the Arctic.

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I hope this helps! Sorry if it doesn't!

Have a great day and God bless! :)

Answer:

populations

Explanation:

Answer: Natural selection occurs when individuals with certain genotypes are more likely than individuals with other genotypes to survive and reproduce, and thus to pass on their alleles to the next generation

Explanation:

All are consequences of ingesting excess vitamin C supplements except Hypoglycemia.

Vitamin C is an essential nutrient that must be obtained through the diet because humans cannot produce it. It has many functions in the body, including aiding in the formation of collagen, the absorption of iron, wound healing, and the maintenance of healthy bones and teeth. A supplement is a manufactured product intended to supplement one's diet by providing additional nutrients, minerals, or vitamins that are not normally consumed in sufficient quantities. Dietary supplements come in a variety of forms, including tablets, capsules, powders, and drinks. The following are some of the consequences of ingesting too much vitamin C:

The following are some of the serious consequences of vitamin C overdose:

Hypoglycemia is not a consequence of ingesting excess vitamin C supplements. Hypoglycemia is a state of low blood sugar that can cause fatigue, shakiness, sweating, and confusion. Excess intake of vitamin C supplements is not known to cause hypoglycemia.

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In the given experiment to investigate if the virus spreads through contact or air, four chambers containing both infected and non-infected bugs are set up as follows:

Here,

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The Pythagorean theorem states that in a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides. The length of the ladder is 8 feet.

To determine the length of the ladder, we can use the Pythagorean theorem, which states that in a right-angled triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. In this case, the ladder acts as the hypotenuse, the distance from the building acts as one side (7 feet), and the height the ladder reaches on the building acts as the other side (unknown). Since the ladder is 1 foot longer than its reach, we can represent the height as x + 1. Applying the Pythagorean theorem, we have 7^2 + (x + 1)^2 = x^2. Simplifying this equation leads to x = 3, which represents the height the ladder reaches on the building. Adding 1 to this value gives us the length of the ladder, which is 8 feet.

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Answer:

Más pollitos son de color púrpura, algunos son híbridos, significa diferente color y pocos pollitos tienen color blanco.

Explicación:

Si se toma un gallo morado (raza andaluza) y se cruza con una gallina blanca de la misma raza, los polluelos serán azules. Al cruzar estos polluelos entre sí, la relación fenotípica es diferente en su descendencia. Más pollitos son de color púrpura, algunos son híbridos, significa diferente color y pocos pollitos tienen color blanco. Esto se debe a que el color púrpura tiene un alelo dominante debido a que más pollitos tienen color púrpura y menos pollitos tienen color blanco debido al alelo recesivo.

Answer: Primary succession is succession that begins in an area w/no remnants of an older community.

Explanation:

\(\sf{\underbrace{\underline{~~~~~Precipitation ~Reaction~~~~~~ }}}\)

A precipitation reaction refers to the formation of an insoluble salt when two solutions containing soluble salts are combined. The insoluble salt that falls out of solution is known as the precipitate, hence the reaction's name. Precipitation reactions can help determine the presence of various ions in solution.

Answer:

1. Skull and crossbones

2. A triangle (commonly painted colour red or yellow) with an exclamation sign inside.

3. biohazard symbol

4. A radiation sign in the form of a triangle, having other little image descriptions inside.

Explanation:

Note that a biohazard material refers to dangerous substances of biological (living) nature that can pose a threat to humans. Thus, safety symbols try as much as to draw attention to the descriptions used.

For example, skull and crossbones and biohazard symbols are used to indicate that a material that is biohazard, such as bacteria could result in the death of a person.

Answer:

B. Produce cells that are genetically identical to one another

Answer:

B

Explanation:

One hypothesis for the Triassic extinction event is fluctuating sea levels that caused a decrease in primary productivity and a loss of habitat for shallow marine species. Fluctuating sea levels can lead to changes in the distribution and extent of shallow marine environments, such as reefs and coastal regions, which are vital habitats for many marine organisms.

These fluctuations may have resulted from a variety of factors, including tectonic activity, climate change, and changes in ocean circulation patterns. As sea levels rose and fell, shallow marine environments could have been submerged or exposed, disrupting the ecological balance and reducing the productivity of primary producers such as algae and plants. This decline in primary productivity would have had cascading effects throughout the food web, ultimately leading to the decline and extinction of many shallow marine species.

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Answer:

Commensalism

Explanation:

It is a symbiotic interaction in which one is benefited while the other is neither harmed nor benefited.

Ultraviolet light can be the answer to future outbreaks because it has the capability to kill the microorganisms present in air and thus can prevent the infectious diseases caused by them.

Ultraviolet light is the EM radiation with the wavelength range 10 nm to 400 nm. It is already being used in research labs for maintaining the microbe free environment. Researches are also being conducted to produce such ceiling lights that can be used normally in households so that the the air-borne microorganisms can be killed.

Microorganisms are the small living organisms not visible to the unaided eyes. They have the strong capability to produce their new variants by mutation and cause infectious diseases. The ultraviolet light can kill them even before they are able to transform themselves.  

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