When you hold your breath, which of the followinggas changes in blood would first lead to the urge tobreathe?
Blood pressure in the mammalian aorta ismaximum during :
Which is the most common mechanism of geneticvariation in the population of sexually reproducingorganism?
Erythropoiesis starts in :
In an ecosystem the rate of production of organicmatter during photosynthesis is termed as:
Which of the following animals is not viviparous