The main functions of at least 3 different organ systems and how they relate to each other.

The circulatory system:the body’s delivery system that circulates blood to deliver oxygen and nutrients to every part of the body.
The digestive system:to turns food into something useful so your cells can turn it into energy.
The endocrine system:it regulates coordinates, and controls a number of body functions by secreting chemicals into the bloodstream.

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.