list ten usefulness of science​

Answer:

Iris Diaphragm controls the amount of light reaching the specimen. It is located above the condenser and below the stage. Most high quality microscopes include an Abbe condenser with an iris diaphragm. Combined, they control both the focus and quantity of light applied to the specimen.

Explanation:

Answer:

The fine focusing knob (wheel) and the coarse focusing knob (wheel).

Explanation:

Thats it. Happy to help. Coarse focusing knob has more dramatic changes in focusing whereas fine focusing knob can focus the finer details. Helpful?

Answer:M

Explanation:

Saw some guy say it

Answer:

M is correct

Explanation:

Did the test.

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 fertilizer must be added according to the land space available.

The reason why a farmer would have to add fertilizer to the farm is so that there would be a better yield of the crops that the farmer is trying to plant. It is true that there are nutrients in the soil but they often need to be supported by the use of fertilizer.

Actually, we can find out that fertilizer is added on the bassi of the kind of space that the land occupies. You can't add more fertilizer than the availaible space. This is why the farmer decided that there was no need to add more than 60 kg of fertilizer for Hector.

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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:

Fitness

Fitness is the measure of how well an individual can survive as well as reproduce.

These differences help them grow, divide, and form tumors. For instance, cancer cells gain the ability to migrate to other parts of the body, a process called metastasis.

Cancer is a group of diseases that can infiltrate or spread to various parts of the body as a result of aberrant cell proliferation. These are the opposite of benign tumors, which don't move. Potential warning signs and symptoms include a lump, unusual bleeding, a persistent cough, unexplained weight loss, and a change in bowel habits. These cancerous symptoms might exist, but there might also be other causes. More than 100 different cancers can affect humans.

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The movements known as dorsiflexion and plantar flexion involve moving the foot.

Dorsiflexion and plantar flexion are specific movements that occur at the ankle joint, involving the foot. Dorsiflexion refers to the movement of the foot in which the toes are lifted towards the shin, while plantar flexion involves pointing the foot downward, as in standing on tiptoes.

These movements are controlled by muscles located in the lower leg, such as the tibialis anterior and the gastrocnemius-soleus complex. The tibialis anterior muscle is responsible for dorsiflexion, contracting to lift the foot and toes, while the gastrocnemius and soleus muscles are responsible for plantar flexion, contracting to point the foot downward.

The movements of dorsiflexion and plantar flexion are essential for various activities, including walking, running, jumping, and maintaining balance. They allow for proper positioning of the foot during gait and contribute to the overall movement and stability of the lower extremity.

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The complete question is:

The movements known as dorsiflexion and plantar flexion involve moving the _____.

Answer:

D.) Rocky

Explanation:

The crust is the top layer of the Earth which is relatively thin in comparison to other layers. The upper layer of Earth is called lithosphere.

The crust is composed of variety of rocks such as metamorphic, igneous, and sedimentary rocks. Below the crust, is the mantle which is also composed of rocks but also have semi-solid magma.

Hence, the correct answer is "D.) Rocky".

When pyruvate dehydrogenase fails in cells, the cells start to use an alternative pathway for the production of ATP. The molecule that can be used by cells to generate ATP when pyruvate dehydrogenase fails are ketone bodies.

Ketone bodies are molecules that are produced by the liver when the concentration of glucose in the blood is low and the concentration of glucagon and adrenaline is high.

The molecule is used by cells to generate ATP through a process known as ketogenesis.

In ketogenesis, the liver breaks down fatty acids to produce ketone bodies, which are then released into the blood and transported to other parts of the body to be used as a source of energy.

The process of ketogenesis can occur when there is a deficiency of glucose, such as during fasting or when a person is on a low-carbohydrate diet.

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Based on what we have learned in this lesson, the terms that would describe the formation of proteins in the body are Polymerization, dehydration and anabolism. Polymerization, dehydration and anabolism would describe the formation of proteins in the body.

Polymerization is the process of combining smaller molecules, called monomers, to form a larger molecule, called a polymer. Dehydration refers to the removal of water molecules to form a larger molecule, such as a protein. Anabolism refers to the building up of molecules in the body, including the formation of proteins. On the other hand, hydrolysis and catabolism are not involved in the formation of proteins in the body.

Hydrolysis refers to the breaking down of larger molecules into smaller ones through the addition of water molecules. Catabolism is the breaking down of molecules in the body to produce energy. Dehydration refers to the removal of water molecules to form a larger molecule, such as a protein. Anabolism refers to the building up of molecules in the body, including the formation of proteins.

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1) The inducer prevents the repressor from binding to the operator, which best describes this regulatory system.

In Bacillus subtilis' negative transcriptional control system.The transcription will be stopped when the repressor binds to the operator. In the event that cobalt is an inducer, the binding of cobalt to the repressor doesn't permit it to bind to the operator. As a result, the gene will be expressed.

The reason for incorrect responses

2. The inducer won't bind to the sigma factor but rather to the repressor.

3. Cobalt cannot directly bind to DNA.

4. Gene expression is typically induced by an inducer.

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Genetic engineering, often known as genetic alteration, is a technique that modifies an organism's DNA using technology developed in labs. This could entail altering a single base pair (A-T or C-G), erasing a section of DNA, or incorporating new DNA. For instance, transferring a gene from one species to an organism from a different species in genetic engineering may result in the desired characteristic.

By transferring a fragment of DNA from one creature to another, genetic modification is a technique to alter the traits of a plant, animal, or microorganism. This is accomplished by carefully removing the desired genes from one organism's DNA and re-adding them to the DNA of the other.Both are same terms.

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Answer:

presence of glucose ,colour is blue

Explanation:

The kidneys eliminate nitrogenous waste, the lungs remove carbon dioxide, the liver excretes bilirubin, and the skin eliminates waste through sweat. These organs work together to ensure the proper excretion of different types of metabolic waste, maintaining the body's overall balance and functionality.

The kidneys are vital organs involved in the excretion of metabolic waste, particularly nitrogenous waste products like urea. They filter the blood and remove waste products, excess water, and electrolytes through urine production.

The lungs play a crucial role in eliminating carbon dioxide, a waste product of cellular respiration. During respiration, oxygen is taken in, and carbon dioxide is expelled through the lungs during exhalation.

The liver is responsible for metabolizing various substances, including drugs and toxins. It helps in the breakdown of hemoglobin, producing waste products such as bilirubin, which is excreted in bile and eliminated through feces.

The skin, being the largest organ of the body, plays a role in excreting metabolic waste through sweat. Sweat contains urea, salts, and other waste products, which are released through sweat glands to regulate body temperature and eliminate waste.

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Answer:

All multicellular organisms use cell division for growth and the maintenance and repair of cells and tissues. Cell division is tightly regulated because the occasional failure of regulation can have life-threatening consequences.

All multicellular organisms use cell division for growth and the maintenance and repair of cells and tissues. Cell division is tightly regulated because the occasional failure of regulation can have life-threatening consequences.

Cell cycle has been as the defined as cycle in which cell produces, grows and divides. The cell cycle has mainly three steps the first one has G1 phase in which the size of the cell increases, S phase synthesis of DNA takes place and the third step has G2 phase in which all cell ready to divide.

Cell has been defined as the base of the life as it has the structural as well as functional unit of life. Cell has been made up of pre existing cells and the cell contain various part cell organelles such as mitochondria, endoplasmic reticulum, ribosomes, golgi appratus, nucleus, and cytoplasm.

Therefore, All multicellular organisms use cell division for growth and the maintenance and repair of cells and tissues. Cell division is tightly regulated because the occasional failure of regulation can have life-threatening consequences.

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Answer:

Option C. is the correct choice.

Explanation:

Food provides "energy" to organisms.

Best Regards!

Answer:

C. Energy

Explanation:

The Preimplantation genetic diagnosis (PGD) is the technology that is used for the examination of embryonic DNA for the presence of disease causing alleles.

As the embryonic DNA came half from paternal and half from maternal side so there are chances that during the fertilization there may be some extra allele that may cause dysfunction or diseases in the embryonic DNA.

The examination of the embryo is necessary to check its allele before the implantation to avoid any further problems. This may also help to know if there are any genetic disorders in the embryonic DNA.

It uses a DNA probe to screen a cell removed from an embryo for disease-causing alleles.

Preimplantation genetic diagnosis (PGD) is used to check if there is a genetic disorder in embryonic DNA by checking alleles.

This is checked before the embryo has entered the uterus before implantation or before pregnancy has begun.

The Preimplantation genetic diagnosis (PGD) use two methodologies :-

FISH ( Fluorescent in situ hybridization)

PCR (Polymerase chain reaction)

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Answer:

it is called a Cline

Explanation:

Greetings!

Properties which make the water biologically important are,

I HOPE THIS HELPS YOU

Answer:

You cant make the organells that detailled or make them at all for that matter?

Explanation:

a medical emergency that causes and intrusion in blood stream to the brain or causes loss of motion called by an ischemic stroke. This thing happen when the blood supply to portion of the brain is hindered or diminished, anticipating brain tissue from getting oxygen and supplements.

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Each mammalian kidney filters blood, processes the filtrate in urine, and releases that urine into a duct called the ureter, which leads to the urinary bladder, where the urine is stored until it is excreted through the urethra.

Each mammalian kidney filters blood through a network of capillaries called the glomerulus, producing a fluid called the filtrate.

The filtrate is then processed in the kidney tubules to produce urine. Urine from each kidney is transported through a muscular tube called the ureter, which connects the kidney to the bladder.

The bladder is a hollow, muscular organ that can expand to hold up to a few hundred milliliters of urine.

When the bladder is full, nerve impulses signal the brain to initiate urination, which involves the contraction of the bladder muscle and relaxation of the urethral sphincters to release urine through the urethra.

The urethra is a muscular tube that carries urine from the bladder to the external urethral orifice. In males, the urethra also serves as a conduit for semen during ejaculation.

The length of the urethra is shorter in females than in males, which makes them more prone to urinary tract infections.

Overall, the urinary system is responsible for regulating the composition and volume of body fluids by removing waste products and excess water from the body.

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Two months later, the same patient is then exposed to chicken pox virus again. The immunoglobulin will be present in the highest amount after this new exposure e. IgG.

Immunoglobulin is a protein that the immune system produces to fight infections. Antibodies, also known as immunoglobulins, are proteins produced by plasma cells that act as the body's defense mechanism against disease-causing bacteria and viruses. Immunoglobulins (Igs) are a type of protein that helps the body's immune system fight infections. The immune system generates immunoglobulins in response to antigens, which are foreign substances such as bacteria, viruses, fungi, and parasites. IgM, IgG, IgA, IgE, and IgD are the five types of immunoglobulins present in the human body.

Immunoglobulins are classified depending on the structure of their Fc domain (the bottom half of the Y), which determines how they interact with other cells of the immune system. Antibodies recognize and bind to specific antigens in the body, marking them for destruction by phagocytes (white blood cells). When a pathogen is encountered again, the immune system can quickly produce more of the same antibody to fight it, leading to immunity against the pathogen. Thus, after the second exposure to chickenpox virus, IgG antibodies will be present in higher amounts as they provide long-term immunity against pathogens. The IgM levels, which were elevated during the first exposure, return to their original levels after a few months, so, the correct answer is (e) IgG.

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schools of parrot fish tend to remain within close proximity to coral reefs for protection from predators and for easy access to food sources represent a distribution known as a density dependent factor

Density-dependent factors can be seen as disease, competition, and predation. Population size can be correlated positively or negatively with density-dependent characteristics. These growth-restricting elements have a positive association with population size, increasing as the population grows.

Parrot fishes  elongated, frequently quite brightly colored, and often rather blunt-headed and deep-bodied.There are roughly 80 to 90 species of parrotfish. They were given their distinctive parrot-like beak and vibrant body colors as names.

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the fastest opportunity we have to immediately slow the rate of global warming

Answer:

It slows global warming

Explanation: I took the test.

Answer:

c.arterioles

Explanation:

Answer:

The subarachnoid space surrounds the brain and spinal cord and provides buoyancy for the brain. It also provides some nourishment for the brain. There are several subarachnoid collections of CSF called cisterns.

Explanation:

Answer:

respiratory system

Explanation:

This system provides oxygen to the brain, but in terms of nutrients to brain cells, then I would say the circulatory system since this carries nutrients to all parts of the body.

I hope this helps you :)