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A- Chromosome, DNA, Gene

Explanation:

Chromosomes have two sister chromatids that connect at the centromere forming a shape similar to an X. DNA is found in a double helix formation, including Adenine, Thymine,  Guanine, and Cytosine. Genes are found per singular section of the DNA double helix.

A

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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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