All living things contain biomass. Which element is the most important when creating biomass?
a. Carbon
b. Nitrogen
c. Oxygen

Some substances but not other can cross the (blank) membrane of a cell

At the age of 6 months, caleb was diagnosed with tay-sachs disease. as his primary care physician, what would you tell his parents about this disease?

If a young male's body is just beginning the process of producing sperm, when is it likely that he would ejaculate mature, viable sperm"