Sea anemone (Adamsia) is marine animal attached to the empty shell of gastropods occupied by hermit crab. They live as symbionts, not as parasites.

Correct Option: D

Sea anemone (Adamsia) is marine animal attached to the empty shell of gastropods occupied by hermit crab. They live as symbionts, not as parasites.

All chordate possess: — Notochord at some stage of life — Dorsal tubular nervous system — Pharyngeal gill slits at same stage of life cycle.

Correct Option: D

All chordate possess: — Notochord at some stage of life — Dorsal tubular nervous system — Pharyngeal gill slits at same stage of life cycle.

Tube feet is the locomotory organ that occurs in star fishes.

Correct Option: B

Tube feet is the locomotory organ that occurs in star fishes.

Vertebrates are also known as craniata due to presence of skull in all its members.

Correct Option: A

Vertebrates are also known as craniata due to presence of skull in all its members.

Metamerism is an important character of annelida and arthropoda. The body is divided externally into segments called metameres. Metamerism is also exhibited by chordata due to repetition of a succession of homologous structures along anterio-posterior axis.

Correct Option: B

Metamerism is an important character of annelida and arthropoda. The body is divided externally into segments called metameres. Metamerism is also exhibited by chordata due to repetition of a succession of homologous structures along anterio-posterior axis.