Scientist hypothesis that some Cambrian period organism are distant ancestors of present day organism. (True or False)

true

because, All major animal phyla, save the Bryozoans, have their first appearance during the Cambrian. One of the dominant animal groups that appeared was the trilobites. These now-extinct members of the Phylum Arthroopoda became the dominant animals in many Cambrian marine environments.

it's c. (to reduce the greenhouse effect/carbon gasses)

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