Which of these is a function of the circulatory system?
a. removing waste from tissues
b. delivering carbon dioxide to cells for cellular respiration
c. transferring impulses from one cell to another
d. all of the above

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

geologic time scale (for gradpoint) =)