What do we best call the field that combines the interests of social and biological psychology?

According to the textbook, what is one of the changes that happens to the brain during senescence?

Neural fluid increases. Mylenation thickens. Cerebral blood circulates more slowly. The corpus callosum increases.

Older adults seek to maintain and develop relationships that are low in conflict and high in mutual enjoyment, and drop the rest. This is as also known as _________

a. emotions-based social relationships b. knowledge-based social relationships c. task-based social relationships d. people-based social relationships