The most common drug that can affect nutrition in older people is

The answer could be numerous types of drugs, but i believe alcohol is your best bet 

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.

Because the carnivores keep the herbivore population in check