An increase in the population, with everything else held constant, will cause .a. An increase in per capita output. b. A decrease in per capita output. c. A decrease in the capital to output ratio. d. An inward shift in the production possibilities boundary

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