Which of the following animal is included in deuterostome?

Explanation

Deuterostomes are a group of animals characterized by their embryonic development, where the anus forms before the mouth. Penguins, as part of the phylum Chordata, are considered deuterostomes. In contrast, Mytilus and Chaetopterus are classified as protostomes, which develop with the mouth forming first. Jellyfish, from the phylum Cnidaria, do not fit into either category due to their unique body structure and embryonic development.