What Three Phyla are Considered to Be Protostomes

Question

What three phyla are considered to be protostomes?
A) Chordata, Mollusca, Arthropoda
B) Cnidaria, Annelida, Mollusca
C) Annelida, Mollusca, Arthropoda
D) Annelida, Nematoda, Mollusca
E) Chordata, Echinodermata, Arthropoda

Accepted Answer

Protostomes are a group of animals characterized by their embryonic development; in protostomes, the mouth develops before the anus during embryonic development. The phyla Annelida (segmented worms), Mollusca (snails, clams, cephalopods, etc.), and Arthropoda (insects, arachnids, crustaceans, etc.) are all considered protostomes.