Question

Are humans protostomes?

Answer 1

Protostomes

1. Protostomes are those groups of animals whose mouth is formed or developed before the anus during embryonic development.
2. This includes arthropods such as insects, molluscs like crabs, annelids like earthworms, etc.

Deuterostomes

1. Deuterostomes are characterized by the formation of the anus before the mouth during embryonic growth.
2. Examples include vertebrates like aves, reptiles, mammals, etc.

Humans

1. During human embryonic development, the anus is formed first and then the mouth.
2. The first opening formed after the cleavage or blastopore forms the anus and the opening opposite to it later forms the mouth.
3. Thus, humans are deuterostomes.