Which staining technique was used to determine that neurons are distinct cells rather than an interconnected web?

The basal ganglia are a set of interconnected structures that contain all but which of the following?

a. globus pallidus b. putamen c. cingulated gyrus d. caudate

Compared to 50 years ago, the average life expectancy for individuals who have intellectual or developmental disabilities is:

a. much longer, approaching a near-normal lifespan for most such people b. slightly longer, but still considerably less than a normal lifespan c. about the same as it was 50 years ago d. slightly shorter, owing to more infants who today are born alive but die in infancy