Q: How are layers of the atmosphere divided? Choices: - air gradients - color gradients - density gradients - temperature gradients A:
temperature gradients

(Question)
Q: Which action of the stomach helps chemical digestion by gastric juice? Choices: - peristalsis - chewing - contraction - churning action A:
(Answer)
churning action

Ques: Q: Nearly all fish reproduce sexually and have what? Choices: - modified sexes - flexible sexes - single sexes - separate sexes A:
Ans: separate sexes

(Q).
Q: What substance can be identified by their atomic number and mass number? Choices: - structures - compounds - solutions - elements A:
(A).
elements

Ques:Q: This series of life stages and events that a sexually reproducing organism goes through is called its what? Choices: - maturation cycle - development cycle - formative period - life cycle A:

Ans:life cycle

Question: Q: What kind of power does not produce any pollutants, but produces waste that can be difficult to dispose of? Choices: - electrical - biofuel - solar - nuclear A:
Answer:
nuclear