Ques:Q: What can be hard or even impossible to perform in a scientific sense? Read this paragraph and choose the correct option from the provided answers: Experiments are sometimes hard or even impossible to do. For example, a scientist who is studying an extinct animal cannot experiment with the animal because it no longer exists. The scientist must rely instead on evidence in the natural world, such as fossils that the extinct animal left behind. Choices: - hypothesises - idea - theorys - experiments A:

Ans:experiments
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Ques:Q: The ozone layer protects the earth from what? Read this paragraph and choose the correct option from the provided answers: Plants maintain the atmosphere. They produce oxygen and absorb carbon dioxide during photosynthesis. Oxygen is essential for cellular respiration for all aerobic organisms. It also maintains the ozone layer that helps protect Earth's life from damaging UV radiation. Removal of carbon dioxide from the atmosphere reduces the greenhouse effect and global warming. Choices: - pollution - light waves - radio waves - uv radiation A:

Ans:uv radiation
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Ques:Q: What is the acid that is released by the stomach that kills most pathogens that enter the stomach? Read this paragraph and choose the correct option from the provided answers: The stomach also releases a very strong acid, called hydrochloric acid. This acid kills most pathogens that enter the stomach in food or water. Urine is also acidic, so few pathogens can grow in it. Choices: - Nitric Acid - Hydrofluoric Acid - Sulfuric Acid - hydrochloric acid A:

Ans:hydrochloric acid
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Ques:Q: When a host attacks a parasitic bacteria, the bacteria release what to surround the cell wall? Read this paragraph and choose the correct option from the provided answers: Some bacteria depend on a host organism for energy and nutrients. These bacteria are known as parasites . If the host starts attacking the parasitic bacteria, the bacteria release a layer of slime that surrounds the cell wall. This slime offers an extra layer of protection. Choices: - bacteriophages - pathogens - protoplasma - layer of slime A:

Ans:
layer of slime
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