How does the "barrier method" give protection from STD's? -It helps the semen travel faster
-It removes vaginal fluid from the body
-it prevents semen from entering another's body
-it causes the blood to flow slower

third option

hope that helps

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