The table below shows the age of fossils found in four separate layers of an undisturbed rock: fossils in rock layers layer fossil in layer age of fossil (million years) a w 550 b x 240 c y 680 d z 450 which is the topmost layer of the rock? layer a layer b layer c layer d

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