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Louie used to smoke when he was stressed out, but he quit smoking eight years ago. After a stressful week at work, he finds his craving for a cigarette returned, though not as strong as it used to be. This experience is best explained by which of the following concepts?

Growing up, Matt often watched his mom fixing things around the house by using screw drivers and hammers. Now, Matt often does odd jobs around the house using the same tools. His learning could best be explained by: 

In a ____________ study, both the researchers and the participants are unaware of the group assignments.

Between work, school, and taking care of her sick mother, Rosemary has found herself regularly forgetting things for class. Her memory failures may in part be due to the fact that the cortisol released during her stress impairs functioning of the ____ .

You are hiking in a forest and come upon a mysterious plant, which you believe to be a lycophyte or a monilophyte. Which of the following would be most helpful in determining the correct classification of the plant?

When diatoms die, their shells fall to the floor of the ocean or lake that they inhabit and form sediments called diatomaceous earth (DE). Diatoms can be identified by their shells. Different species of diatoms prefer different water temperatures. What information can be gained if scientists take samples of long-existing DE and identify the diatom species that created it?

The use of I131 for thyroid imaging:

Imaging of the thyroid takes place:

Pheochromocytomas and neuroblastomas are disorders of the adrenal medulla.

In the primary hypothyroid state, one would expect the T3 and T4 to be elevated.