Blood pressure in the mammalian aorta is
maximum during :

Which is the most common mechanism of genetic
variation in the population of sexually reproducing
organism?

Erythropoiesis starts in :

In an ecosystem the rate of production of organic
matter during photosynthesis is termed as:

Which of the following animals is not viviparous

The mass of living material at a trophic level at a particular time is called :