_____ disease appears to have developed as a mutation that helped protect people from malaria

Giraffes were once either short-necked or long-necked. As soon as vegetation died, the giraffes that had the gene for long necks survived and passed their characteristics on to their offspring. This best illustrates:

a. natural selection b. social Darwinism c. psychosocial reproduction d. the unconscious id

Prenatal exposure to X-rays is associated with

a. leukemia. c. deformed limbs. b. cerebral palsy. d. blindness.