Name Period
Simple Invertebrates - Sponges, Cnidarians, Flatworms and Roundworms
amel aterrany Curtis
Exam
Multiple Choice
dentify the letter of the choice that best completes the statement or answers the question.
1. Many small aquatic organisms move oxygen and carbon dioxide through their skin by
the process of
a diffusion.
c cephalization.
d muscular contractions.
b extracellular digestion.

Small aquatic organisms use A. Diffusion to move oxygen and carbon dioxide

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