What allowed native americans in mexico to settle cities larger than those in areas to the north?
a. the use of advanced engineering methods learned in asia.
b. the use of farming to feed a larger population.
c. the development of cities that were built by an earlier civilization.
d. the requirement of their religion to have large cities.

Rick is a toddler with an easy temperament and active nature. people are often seen stopping to talk to him in supermarkets and parks where his mother takes him in the evenings because he smiles willingly at other children and adults. this aspect of rick’s behavior most likely reflects a(n) active genotype–environment interaction suppressive genotype-environment interaction passive genotype–environment interaction evocative genotype–environment interaction