. I think that bivalves have evolved to have smaller head regions because they have also evolved to have bigger shells or valves than cephalopod
Capillaries are one cell thick and so this makes them very thin. capillaries are also arranged in networks known as capillary beds, and thus multiple capillaries are spread over a large area.
It is the fraction of all chromosomes in the population that carry that allele.
The branch of biology dealing with interactions along organisms and between organisms and their environment is called Ecology, I believe.
Out of the following choices given, the true statement about diffusion is molecules move from areas of high concentration to areas of low concentration. The correct answer will be D.
