The point at which a person can detect a stimulus 50 percent of the time it is presented is called the ______

Human sex cells, sperm and ova, each contain how many chromosomes?

a. 23 b. 46 c. 23 pairs d. 46 pairs

Feeling guilty is typically accompanied by ____ physiological responses that can be measured by a polygraph

a. involuntary c. voluntary b. controlled d. brief