If you examine a natural population of bacteria, it is common to find some antibiotic-sensitive and some antibiotic-resistant strains, even if the population has never been exposed to any antibiotic. which explanation could account for this situation?

The resistant strain developed as a mutation and had no negative effect on fitness.

Explanation:

In examining a natural population of bacteria, resistant strain developed as a mutation which has no negative effect on fitness often causes observations of antibiotic-sensitive and some antibiotic-resistant strains, even if the population has never been exposed to any antibiotic.

manifest functions are the recognized and intended consequences of any social pattern, while latent functions are those unrecognized and unintended consequences. to analyze the manifest functions of any social institution, we have to study its contribution to the continuation of a group, community, or society.