Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus? Choices: - magnetism - electrolysis - electromagnetism - radioactivity A:
radioactivity

(Question)
Q: Some reactions need extra help to occur quickly. they need another substance called what? 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? 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? 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? Choices: - nerves - tendons - tissues - muscles A:

Ans:muscles

Ques:Q: Surprisingly, where would you find the earth's tallest mountains and deepest canyons? Choices: - Tibet - rain forests - taiga - ocean floor A:

Ans:
ocean floor