The cyclical changes in the ovaries of female placental mammals during the reproductive phase differs in primates and nonprimates.
a. What is this cycle called in primates and nonprimates respectively?
b. Distinguish between seasonal breeders and continuous breeders.

Explanation

a. In primates the cycle is called as menstrual cycle and in nonprimates it is called as oestrus cycle.
b. Many mammals living in natural conditions exhibit such reproductive cycles only during favourable seasons, therefore called as seasonal breeders. Others are reproductively active throughout their reproduc tive phase and hence called as continuous breeders.