Question

within the phylum arthropoda, which of these classes undergoes metamorphosis?
insects
crustaceans

Explanation:

In the Phylum Arthropoda, the class Insecta (insects) is well - known for undergoing metamorphosis (complete or incomplete). Crustaceans typically have a different type of development that is not characterized as metamorphosis in the same way as insects. For example, insects like butterflies have complete metamorphosis (egg - larva - pupa - adult) and grasshoppers have incomplete metamorphosis (egg - nymph - adult), while crustaceans like crabs and shrimps have a series of molts as they grow but not the distinct metamorphic stages seen in insects.

Answer:

A. insects