Cells sometimes use passive transport to move molecules across their membranes. The rate at which a cell engages in passive transport is determined by A the number of vacuoles that the cell contains.
B the amount of energy that the cell generates.
С the composition of the cell membrane.
D the size of the cell's chloroplasts.

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Explanation:

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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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