Random Descent with Modification creates new variations of traits... so what does the farmer actually do?

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

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.

3. is true i think i should be right

  eukaryotic cells may arise from sexual reproductions, resulting in more genetic variation  i would say that is the answer