The set of blood vessels with the lowest blood pressure driving flow is

a) the arteries.
b) the arterioles.
c) the metarterioles.
d) the capillaries.
e) the veins.

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.

Why do mountaineers become breathless as they reach high altitudes