Select the correct answer. Over the last 250 million years, the world changed from a single land mass to a number of different continents. One reason for the change is
expanding ocean floors. What causes ocean floors to expand?
A. convergent plates
B. divergent plates
C. slab pull
D. uplift

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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:

no u