$12$ pairs of cranial nerves are present in

Which one of the following phyla is correctly matched with its two general characteristics?

In which animal phyla is metameric segmentation observed?

Give an example of the following:
$(a)$ Roundworm
$(b)$ Fish possessing poison sting
$(c)$ $A$ limbless reptile/amphibian
$(d)$ An oviparous mammal

Which of the following is a correct group?

Cold-blooded animals are those having