In a population of beetles, some are green, some are brown, and some are mixed. if the beetles live in vegetation, the colored beetle is "least fit" and least likely to survive in that habitat when birds come along looking for food. a. green b. brown c. mixed

Answer:- Option B Brown

Explanation:-

When the beetles are living in a vegetation, then the most important point is that they are living in an environment where green is the predominant color.Since, the birds who will come to look for food, will have to identify  the beetles against a green backdrop the green beetles are most safe as they can easily merge with their green surroundings. This is known as camouflage.The mixed beetles will be less fit as compared to the green beetles as the chances of them to be identified by the birds will be more as they are not completely green and are not able to fully merge with the surroundings.However, the brown beetles will be least fit to survive in this environment as they can be most easily identified against the green backdrop. They will be the most conspicuous of the three beetles. Thus, the birds will feed more often on the brown beetles and hence, they are least fit to survive in the vegetation.

This phenomena in which the organism who is best adapted to survive in a given environment and leave more progeny is termed as survival of the fittest.

D.) domain, kingdom, phylum, class, order, family, genus, species