Answer: Cells typically receive signals in chemical form via various signaling molecules.
Answer:
density dependent factors are competition, predation, parasitism, disease/ independent factors are natural disaster, seasonal cycle, unusual Weathers
All 3 of them explain the reason why people wear the mask to stop HIV
Difficult to change - nutrients! crops won’t grow on soil that has had all of the nutrients used up. example: after growing corn in the same place for 50 years, corn will not grow anymore because all of the nutrients it needs to grow will no longer be in the soil
Answer:
When there is a cut, and platelets are coming, its positive feedback. But when the clot is formed and increased platelets concentration at the site create a negative feedback to stop sending more platelets for clot formation.