21 Explain two possible reasons why a person who looks well could still be a source of infecting
microorganisms. (130-140 words)

Due to strong immune system and dormant state.

Explanation:

If a person who looks well could still be a source of infecting  microorganisms because the microorganisms present in its body not affected him due to powerful immune system but it can cause infection in the body of those person who have weak immune system. The other reason is that microorganisms are present in dormant state due to unavailability of good growing condition but when they got good conditions they became active and causes infection.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

im not intirely sure but i think the anwser is d relative humidity