you order a pure culture of bacteria streptococous pneumoniae from a biological supply company. when the culture arrives, you correctly follow all proper steps of the asceptic technique to transfer the culture to an agar plate. after incubating the agar plate, you look at the culture under a microscope. you see bacterial colonies of all shapes, sizes, and colors. should you request a refund from the supply company

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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which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements