This is known as parasitism.
In biology, parasitism is a relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.
Answer:
move to a cold, moist, and unstable weathered environment. :)
Explanation:
It detects that the small amount of virus added and it learns to fight off the flu which helps keep you from getting it
Answer:
it's called the threshold potential.
Explanation:
it triggers the nerve impulse, or action potential
