Essential amino acids are those that:

A. include minerals such as calcium and iron.
B. cannot be synthesized biochemically and must be taken in through the diet.
C. can only be found in plants.
D. provide essential vitamins

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?