Enzymes that join two substrates and require energy of a nucleoside triphosphate (such as ATP) to do so are called .

answer; ///i do believe the answer is (virus);

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

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

yes, because even though a theory has a  lot of evidence to support it, it is not always true