The largest animal group, both in number of species and number of individuals, is the

A) annelids.
B) crustacea.
C) insects.
D) reptiles.
E) fishes.

Insects

A class of arthropods characterized by a three-part body, including a head, thorax, and abdomen, three pairs of jointed legs, compound eyes, and one pair of antennae.

Species

Group of similarly constructed organisms capable of interbreeding and producing fertile offspring; organisms that share a common gene pool; the taxon at the lowest level of classification.

Individuals

Refers to distinct beings, often used in the context of discussing singular human beings.