Fertilization is _____________ Reptiles.

Reptiles respire through ____________ .

Common between ostrich, penguin and kiwi is that all are  .......................  birds.

Metamorphosis can be defined as biological  process in which  _______________

Identify the organisms on the basis of following features -

(i) Warm - blooded,

(ii) four - chambered heart,

(iii) Lay eggs,

(iv) Body covering of feathers,

(v) Breathe through lungs

Which one is a true fish?
 

Which of the following are correct :

(a) Amphioxus (Branchiostoma) is the only living representative of this subphylum.

(b) Amphioxus (Branchiostoma)  are transparent, fishlike creatures without a brain and eyes.

Elasmobranchs do not have

Which type of scales are present in the class Osteichthyes ?

The bony fishes differ from the cartilagenous fishes in the fact that _______________________ .