Betty's mom points out a dump truck to Betty on the way to daycare. On the way home in the evening, they pass another dump truck and Betty correctly labels it. Betty's ability to pick up the word "dump truck" so quickly is called:

A major reason why people won't help when there are many bystanders is because:

a) of diffusion of responsibility. b) people are egoistic. c) people like to see others hurt. d) people are not altruistic.

Professor Murphy is studying neurons that release a particular small-molecule neurotransmitter. In these many of these neurons, the professor should expect to see a. no other types of neurotransmitters

b. a second type of small-molecule neurotransmitter. c. at least one type of neuropeptide neurotransmitter. d. at least one other type of small-molecule neurotransmitter and multiple types of neuropeptides neurotransmitters.