Earthworms live and reproduce within the soil. They aerate the soil (add air) and add organic material to it. Other organisms perform similar functions in other environments, but earthworms are good at aerating and adding organic matter to soil. Together these statements best describe an earthworm’s:

A. environment

B. habitat

C. nutrition

D. niche

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a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

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