Question

Which set has the two members of the same phylum ?
(1) Cuttle fi sh and jelly fi sh
(2) Tape worm and earthworm
(3) Dog fi sh and dolphin
(4) Sea mouse and sea lion​

Answer 1

Answer:

third option is correct one

Explanation:

Dog fish and dolphin

Answer 2

Dogfish and dolphins are members of the same Phylum.

• Dogfish is a Chondrichthyes i.e. a cartilaginous fish.
• Following is its classification:

Dogfish-

1. Kingdom - Animalia
2. Phylum - Chordata
3. Subphylum - Vertebrata
4. Class - Chondrioicthyes
5. Order - Selachii

• Dolphin is a mammal (consisting of mammary glands).
• Following is its classification:

Dolphin-

1. Kingdom - Animalia
2. Phylum - Chordata
3. Subphylum - Vertebrata
4. Class - Mammalia
5. Order - Cetacea

• Hence both are members of Phylum Chordata.
• All other options consist of animals from different phyla.
• Cuttlefish - phylum Molluscs and jellyfish - Ceolentrata
• Tapeworm - Platyhelminthes  
• Earthworm and Sea mouse- Annelida
• sea lion - Chordata