Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus? Read this paragraph and choose the correct option from the provided answers: Radioactivity is the ability of an atom to emit, or give off, charged particles and energy from the nucleus. The charged particles and energy are called by the general term radiation . Only unstable nuclei emit radiation. When they do, they gain or lose protons. Then the atoms become different elements. (Be careful not to confuse this radiation with electromagnetic radiation, which has to do with the light given off by atoms as they absorb and then emit energy. ). Choices: - magnetism - electrolysis - electromagnetism - radioactivity A:
radioactivity

(Question)
Q: Some reactions need extra help to occur quickly. they need another substance called what? Read this paragraph and choose the correct option from the provided answers: Some reactions need extra help to occur quickly. They need another substance called a catalyst. A catalyst is a substance that increases the rate of a chemical reaction. A catalyst isn't a reactant, so it isn't changed or used up in the reaction. Therefore, it can catalyze many other reactions. Choices: - neurotransmitter - protein - hormone - a catalyst A:
(Answer)
a catalyst

Ques: Q: The peripheral nervous system consists of all the nerves that are found outside what? Read this paragraph and choose the correct option from the provided answers: The peripheral nervous system consists of all the nerves that are found outside the central nervous system. Choices: - large nervous system - autonomic nerous system - somatic nervous system - central nervous system A:
Ans: central nervous system

(Q).
Q: Do tropical regions have very high or very low rates of immigration? Read this paragraph and choose the correct option from the provided answers: Choices: - medium - too high - low - very high A:
(A).
very high

Ques:Q: In vertebrates, a system of what structures attached to the endoskeleton enables movement? Read this paragraph and choose the correct option from the provided answers: Vertebrates have a system of muscles attached to the endoskeleton to enable movement. Muscles control movement by alternately contracting (shortening) and relaxing (lengthening). Generally, muscles work together in opposing pairs. Choices: - nerves - tendons - tissues - muscles A:

Ans:muscles

Ques:Q: Surprisingly, where would you find the earth's tallest mountains and deepest canyons? Read this paragraph and choose the correct option from the provided answers: Scientists have learned a lot about the ocean floor. For example, they know that Earth's tallest mountains and deepest canyons are on the ocean floor. The major features on the ocean floor are described below. They are also shown in Figure below . Choices: - Tibet - rain forests - taiga - ocean floor A:

Ans:
ocean floor