Match up the correct behavior with the condition that precedes it

The process of sorting sperm samples into cells with X and Y chromosomes and introducing a "lopsided" sample of sperm to the uterus during fertile periods is called

a. sperm forecasting. c. genetic engineering. b. sex preselection. d. cloning.

Every time Bert slices onions, the onions burn his eyes and tears run down his face. One day he opened the silverware drawer and pulled out the knife that he uses only to peel onions and immediately started to shed tears from the sight of the knife. In this situation, the onion is the __________, and the knife is the __________.

A. conditioned stimulus; unconditioned stimulus B. unconditioned stimulus; conditioned stimulus C. conditioned response; unconditioned response D. unconditioned response; conditioned response