Which of the following statements regarding mutations is true? Mutations - A -occur randomly and increase genetic variability.
B- are usually harmful and cause the organisms to die.
C- are caused by changes in an organism's environment.
D- occur at the consistent rate in nearly every population.

a

Explanation:

Insects have a range of mouthparts, adapted to particular modes of feeding. The earliest insects had chewing mouthparts. Specialization has mostly been for piercing and sucking, although a range of specializations exist, as these modes of feeding have evolved a number of times (for example, mosquitoes and aphids (which are true bugs) both pierce and suck, however female mosquitoes feed on animal blood whereas aphids feed on plant fluids. In this page, the individual mouthparts are introduced for chewing insects. Specializations are generally described thereafter.