Which of the following includes only deuterostomes?

Question

Quizplus · Accepted Answer

Deuterostomes are a group of animals in which the blastopore (the opening formed during gastrulation) develops into the anus. This group includes echinoderms (e.g. starfish), which evolved during the Cambrian explosion, along with hemichordates (e.g. acorn worms) and chordates (e.g. vertebrates). Choice B includes only deuterostomes, as it includes echinoderms (represented by the "starfish"), along with humans (represented by "human" and "chicken"), which are also deuterostomes. The other choices include animals that are not deuterostomes, such as mollusks (e.g. snails) and sponges.

Which of the Following Includes Only Deuterostomes