Concluded that bacteria could be transformed from harmless to dusease-causing by an unknown factor

In 1927, Fredric Griffith concluded that bacteria could be transformed fromharmless to disease-causing by introducing a factor that was not yet identified.This changing factor was eventually discovered to be DNA, the basis for all.biological reproduction

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.

The casefor proofs