The rate of obesity among young people has more than ______ since 1980

In Piaget's theory, the stage of cognitive development between 7 and 11 years of age, in which an individual can attend to more than one thing at a time and can understand someone else's viewpoint,

though the individual is still not capable of fully abstract reasoning, is the ______ stage. a. concrete-operational c. sensory-motor b. preoperational d. formal-operational

Biologists have cataloged many species that determine the allocation of mating opportunities, food, and other resources, both within and between groups, by ____

a. ?cooperation, usually among females b. ?communication, usually audible c. ?competition, usually in the form of fighting d. ?altruistic behavior, usually within the family