While many invertebrates have an exoskeleton, vertebrates such as fishes have an endoskeleton. of what advantage is the endoskeleton to these animals?

Well one advantage is their back skeleton is in the inside

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.