Mention two similarities between
(a) Aves and mammals , (b) A frog and crocodile
A turtle and Pila

Explanation

(a) Similarities between aves and mammals
(i) The members of both the groups are homeotherms, i.e., warm blooded. They are able to maintain constant body temperature.
(ii) Heart is completely four chambered.
(b) Similarities between frog and crocodile
(i) The members of both the group are poikilotherms, i.e. they lack the capacity to regulate their constant body temperatuer. They are cold clooded animals.
(ii) Frog and crocodile are oviparous animals.
(c) Similarities between turtle and pila
(i) In both animals, body is covered with dry and cornified skin. In turtle, the epidermal covering is known as scales whereas in case of Pila, it is known as calcareous shell.
(ii) Both animals are oviparous.