"Student's" t test was invented by

In the nineteenth century, the discovery of syphilis helped scientists understand that

a) psychological disorders could be contagious and transmitted through human-to-human contact. b) the spread of bacteria caused most psychological disorders c) mental illness was caused by ruptured blood vessels in the brain. d) a physical disease could cause a psychological disorder.

Natalia, a preterm infant, maintained skin-to-skin contact with her parents in an effort to promote development. This skin-to-skin contact is called

a. pouch care. c. marsupial care. b. kangaroo care. d. massage care.