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.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".