Which describes the composition of the ocean floor?

a. basalt covered in sediment
b. sediment covered in basalt
c. granite covered in sediment
d. basalt covered in granite

the supermassive black hole is in the middle of the galaxy.

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

i think its white blood cells

i hope this