Q: What do many scientists think are the oldest eukaryotes? Choices: - prokaryotes - plants - arthropods - protists A:
protists

(Question)
Q: What makes echinoderms force water into the feet and move forward? Choices: - spring contractions - vacuum contractions - field contractions - muscle contractions A:
(Answer)
muscle contractions

Ques: Q: Gas exchange during respiration occurs primarily through what? Choices: - vaporization - secretion - activation - diffusion A:
Ans: diffusion

(Q).
Q: A diploid zygote is formed when one sperm does what? Choices: - cracks the egg - repels the egg - incapacitates the egg - fertilizes the egg A:
(A).
fertilizes the egg

Ques:Q: Much of what type of radiation that strikes the planet is reflected back into space? Choices: - magentic radiation - gamma rays - microwaves - solar radiation A:

Ans:solar radiation

Question: Q: What is the name of the protein that is found in hairs and nails? Choices: - cellulose - chromatin - Skin - keratin A:
Answer:
keratin