Ques:Q: What do corals secrete that builds up to become a coral reef? Choices: - membrane - mucous - scales - exoskeleton A:

Ans:exoskeleton
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Ques:Q: What makes echinoderms force water into the feet and move forward? Choices: - spring contractions - vacuum contractions - field contractions - muscle contractions A:

Ans:muscle contractions
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Ques:Q: What is the term for a galaxy that is a rotating disk of stars and dust? Choices: - cosmic galaxy - nebula - Milky Way - spiral galaxy A:

Ans:spiral galaxy
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Ques:Q: What happens to the recessive traits in the offspring of a hybridization? Choices: - they dominate - remain recessive - they replicate - they disappear A:

Ans:
they disappear
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