What is characterized by cities, written language, and specialization of work?

Bill hates to clean up after dinner. One night, he volunteers to bathe the dog before cleaning up. When he finishes with the dog and returns to the kitchen, his wife has cleaned everything up for him. Which of the following statements is most likely TRUE?

a) Bill will start cleaning up the kitchen before he bathes the dog. b) Bill's wife has positively reinforced him for bathing the dog. c) Bill's wife has negatively reinforced him for bathing the dog. d) Bill will never bathe the dog again.

In one study, more active fetuses during the third trimester became 2-year-olds who

A) were easily overwhelmed by sensory stimulation. B) had trouble establishing a regular sleep–wake pattern. C) had irregular eating schedules. D) were less fearful.