Each of a Number of small areas of habitat, typically of one square meter, selected at random to act as samples for assessing the local distribution of plants or animals.
DNA is the ultimate control of cell's productions. So A.
DnaG
That’s the first answer that came up on google
He discovered the fundamental laws of inheritance through his work on pea plants believe it or not!
A normal range in adults is generally considered to be 4.35 to 5.65 million red blood cells per microliter (mcL) of blood for men and 3.92 to 5.13 million red blood cells per mcL of blood for women. In children, the threshold for high red blood cell count varies with age and sex.