Which class of animals has the largest number of species?

A) Arachnida
B) Insecta
C) Gastropoda
D) Bivalvia
E) Arthropoda

Species

A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding to produce fertile offspring.

Arachnida

A class of joint-legged invertebrate animals in the arthropod phylum, including spiders, scorpions, ticks, and mites.

Insecta

The class of arthropods that includes insects, characterized by a three-part body, compound eyes, antennae, and, typically, two pairs of wings.