The branch of science dealing with the study of birds is

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

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Water vascular system	$(i)$ Balanoglossus
$(b)$ Malpighian tubule	$(ii)$ Hyalonema
$(c)$ Amphiblastula	$(iii)$ Sea lily (Antedon)
$(d)$ Proboscis gland	$(iv)$ Periplaneta

Which of the following organisms does not show any body segmentation?

These animals are oviparous or ovoviviparous and exhibit internal fertilization.

Which of the following is correctly matched?