A(n) pathogen causes disease only when conditions are favorable for the microorganism because of transfer to an inappropriate body site or weakened immunity in an individual.

Opportunistic.

Explanation:

Pathogen may be defined as the disease causing organism. The opportunistic pathogen causes disease mostly in the organism with weak immune system of the body.

The opportunistic pathogen can cause disease if the environmental condition is favorable for pathogen. These pathogens are not capable of inducing disease in the healthy individual.

Thus, the answer is opportunistic.

coal is not sustainable because it will one day run out.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.