1. a. The brain has excess neurons at birth. b. There are about 100 billion nerve cells in the adult brain. c. Some nerve cells die during the first few years of life. d. Our brain can generate new nerve cells e. All of the above are correct.

2. a. Learned b. Critical c. Innate d. Somatic e. cerebral

3. a. Being the largest of the species. b. Not competing with members of the same species c. Possessing the best coloring and shape of the species. d. The passing of genes along to succeeding generations. e. The uniqueness of the species.

4. a. Axon, dendrite, soma, terminal button b. Terminal button, soma, dendrite, axon c. Dendrite, soma, axon, terminal button d. Dendrite, axon, soma. Terminal button e. Axon, soma, dendrite, terminal button

5. a. Hormones; glands b. Hormones; nerve cells c. Neurotransmitters; glands d. Neurotransmitters; nerve cells e. Neurons, axons

6. a. Producing neurotransmitters b. The production of myelin sheath c. Structural support for neurons d. Certain brain diseases such as MS. e. Helping to form new synapses

7. a. Somatic nervous system b. Sympathetic nervous system c. Parasympathetic nervous system d. Autonomic nervous system e. Afferent nervous system

8. a. Neurotransmitter b. Agonist c. Antagonist d. Hormone e. endorphin

9. a. Analyze dreams b. Discover how people learn c. Discover how a an individuals behavior changes when with others. d. Use introspection to uncover the client's unselfish thoughts. e. Make psychology more objective.

10. a. Structuralist b. Psychodynamic c. Biological d. Engineering e. behavioral