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Questions and Answers
What is a unifying theme in the field of biology?
What do all organisms have in common?
What allows organisms to move, grow, and reproduce?
What do biologists use to make observations and pose questions?
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At what levels of organization do biologists study life?
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What is the primary process by which gases move passively across a surface?
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In unicellular organisms, what is typically the gas exchange membrane?
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What is the primary surface for gas exchange in small multicellular organisms like flatworms?
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What is the boundary between an organism and its extracellular environment that can serve as a gas exchange surface?
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Why is an efficient system for gas exchange required in most living things?
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