Fish, amphibians, reptiles and mammals are placed in the same phylum, Chordata, due to common features like:
I) Presence of notochord
II) Presence of dorsal, hollow neural system
III)Presence of dorsal, solid neural system
The correct statements are:

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(I) and (II)

(I) and (III)

Only (I)

Only (III)

answer is C.

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Detailed Solution

Fishes, amphibians, reptiles, and mammals are all classified within the phylum Chordata due to common features that include:

Presence of notochord: The notochord is a flexible, rod-like structure that provides support to the body and is found in the early stages of development in all chordates.
Presence of dorsal, hollow neural system: Chordates have a dorsal, hollow nerve cord that runs along their back. This nerve cord eventually develops into the spinal cord in vertebrates (such as fish, amphibians, reptiles, and mammals).

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