NEET BIOLOGY

Detailed explanation-1: -Echinodermata is the phylum that includes invertebrate marine animals. They do not possess the five key features that characterizes the chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, a post-anal tail and endostyle. Hence, option (b). Echinodermata is the correct answer.

Detailed explanation-2: -Final answer: Pleurobrachia is not a member of phylum ‘Chordata’.

Detailed explanation-3: -Non-chordates are animals without a notochord – the rod-like elastic structure that supports the body. This phylum consists of a small group of worm-like, marine species with an organ-system level of organization.

Detailed explanation-4: -Pandas, crows, sharks, salamanders, alligators, sea squirts, and many others are examples of chordates. So, in essence, to answer the question, amphibians, reptiles, and mammals comprise which group?-the answer is simply they belong to the phylum Chordata.