In what way did european migration most impact the increased diversity of south america?
a) europeans came from several different countries and introduced the african slave trade
b) the only europeans that settled were from spain and portugal
c) early european landholders enslaved native americans and forced them to work on plantations.
d) european rule led to political revolutions that resulted in democratic forms of government.

Whether or not a given study has the possibility of causing harm to participants:

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

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