What type of love characterizes most friendships and involves intimacy without passion or commitment?

B. F. Skinner sought explanations of behavior in terms of what?

a. Unconscious thought processes b. Imbalances among neurotransmitters c. Ethnic and cultural influences d. Previous reinforcements

Growth cones are defined as a. the influences of neighboring cells on differentiation

b. attractant chemicals that guide axon growth and inhibit meiosis. c. death genes that are expressed when a cell "decides" to die, leading to the formation of exact replacements for that cell. d. swollen ends of axons and dendrites that help the branch reach its synaptic target.