Ques:Q: What is the only continent without amphibians? Choices: - Australia - Europe - Africa - antarctica A:

Ans:antarctica
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Ques:Q: A substance that displays different colors when in the presence of an acid or a base is called what? Choices: - pH scale - reactor - litmus test - an acid-base indicator A:

Ans:an acid-base indicator
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Ques:Q: After a massive eruption what will a mountain collapsing above an empty chamber create? Choices: - crater - cavern - valley - caldera A:

Ans:caldera
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Ques:Q: Cells in a biofilm secrete what to recruit nearby cells? Choices: - signaling proteins - harnessing molecules - signaling neurons - signaling molecules A:

Ans:
signaling molecules
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