Neurotransmitters (like acetylcholine) are required to conduct nerve impulses because the neurons do not physically touch each other or the cells on which they are acting.

Construct at least two possible hypotheses for the student’s experiment.

Which of the following would most directly interfere with sperm production? ingestion of a substance that mimicked inhibin interruption of sustentocytes' production of abp low sperm count use of synthetic steroids (testosterone)

What is the difference between hypothesis, theories, laws, and observations?