Ques:Q: What is the temperature at which a substance freezes known as? Choices: - absolute zero - zero point - drop point - freezing point A:

Ans:freezing point
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Ques:Q: What do you call a period when temperatures are cooler than normal, causing glaciers to spread? Choices: - polar age - earth age - thermal age - ice age A:

Ans:ice age
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Ques:Q: In aquatic communities, the main producers are photosynthetic protists and what? Choices: - arthropods - eukaryotes - crustaceans - prokaryotes A:

Ans:prokaryotes
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Ques:Q: The size and symmetry of a beetle's or an elk's antlers or a grasshopper's song communicate rather clearly their state of what? Choices: - society - problem - need - health A:

Ans:
health
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