As the ____ of a group increases, so does ____ within the group

Until the past century, people who survived into young adulthood and beyond were nevertheless susceptible to death from infection diseases such as diphtheria, tuberculosis, and smallpox.

a. true b. false

What is meant by a "feature detector" in the visual system?

a. An electrical device that records the activity of neurons b. A stimulus that excites a certain pattern of responses c. A gene that controls differences in visual perception d. A neuron that responds to a particular visual pattern