In the skin, the epidermis can be compared to which of the following?

a. A wall that protects a country from invaders
b. A ship that transports cargo
c. A telephone line used to communicate information
d. A switch that turns a light on

a

explanation:

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