The human gene sequence number is thought to be 25,000; thus, humans have many more genes than other far less complex organisms

What does the chi-square test compare?

a. Observed and expected frequencies b. Sample means c. Population means d. Population standard deviations

What did psychiatrists in the mid to late nineteenth century believe was the primary cause of emotional problems?

A. An imbalance of the four humors B. The depletion of bodily energies as a result of excesses in living C. Untreated brain damage during birth D. The rejection of religious values