Down syndrome is a condition in which the individual has which chromosome?
a. 3 copies of chromosome 23
b. 3 copies of chromosome 21
c. lacks chromosome 46
d. has only one chromosome 21

Hey answer ma question
Which of the following is an example of a long-term climatic change? 
       A. Winter   B. Summer   C. Ice age   D. La Niña

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.