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 .

unconditioned stimulus; conditioned stimulus

Explanation:

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 unconditioned stimulus and the knife is the conditioned stimulus meaning that the onion is an unintended stimulus while the knife is an intended stimulus.

the correct answer is ) possibility.

demonstrating opportunity cost is done through production possibility.

the opportunity cost can be demonstrated using the production possibility frontier or curve. this graphic shows the total number of possibilities for two products when we have the resources needed and used in an efficient manner. the main resources could be money, labor, and technology. the curve shows that the production of one good increases when the production of the othe

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;