The day has less hours of sunlight in the winter because the northern hemisphere tilts the sun. also, the sun's rays do not aim directly on the land and the water. this causes winter to be cooler or cold.

the answer is the northern hemisphere tilts toward the sun

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