In comparison to the "shape" of the U. S. population pyramid today, in 2025 this shape will become more "rectangular."

Zeena is 3 months old. She is taking part in a research study in which one end of a string is tied to her wrist and the other end is tied to a screen. When she moves her hand, the screen lifts and she can see a toy on the other side. How many days after learning this task will Zeena be able to remember it?

a. 12 hours b. 1-2 days c. 3-4 days d. More than one week

A biological bridge between the experience of stress, circadian rhythms, and the development of depression is formed by hormones released at times of stress, including ____.?

a. ?cortisol b. ?serotonin c. ?orexins d. ?benzodiazepines