Answer:
A. cancer cells aren't outside cells. they are our own cells that have been damamged over time and mutate to become cancerous
Your answer is...
D. Abstinence
I learned it in health class...
Answer:
1921
Explanation:
Acetylcholine was the first neurotransmitter to be discovered. It was isolated in 1921 by a German biologist named Otto Loewi, who would later win the Nobel Prize for his work.
Explanation:
Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi; the diseases can be spread, directly or indirectly, from one person to another. Zoonotic diseases are infectious diseases of animals that can cause disease when transmitted to humans.
