Rudy just turned 17 and has begun to hang with a bad crowd engaging in antisocial behaviors (e.g., drug use). His parents react by taking away his cell phone and treating him in a less supportive manner. Which family systems model is best exemplified by Rudy's parent's reaction?

The result of synaptic pruning is to allow established neurons

a. to make room for more neurons. b. to provide more space for each established neuron. c. to build more elaborate communication networks with other neurons. d. to die off so that new neurons can develop.

By 40 days after conception, swellings are clearly visible at the anterior end of the neural tube. There are

A) 2. B) 3. C) 4. D) 32. E) 64.