Question

iii) Only two layers ectoderm and endoderm develop in
a) sponges
b) annelids
c) nematodes
d) cnidarians
iv) Dolphin is included in
a) Aves
b) Mammals
c) amphibia
d) reptilian​

Answer 1

Answer:

iii) Cnidrians

iv) Dolphins are mammals

Explanation:

iii) They are diploblastic .

iv) Though dolphin lives in water they are mammals as they are warm blooded animals,they breath air, give birth to live young, lactate and have hair.