Which of these statements is true of ecosystems? a animals do not travel from one ecosystem to another ecosystem b the total amount of energy in an ecosystem does not change c air cannot be used by organisms once the air moves out of the ecosystems d matter lost by one ecosystem is gained by the surrounding environment

for the points

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

cell/ tissue/ organ/ organ system/ body