Research has shown that when waking up in the morning, individuals high in dispositional optimism have a lower response of which chemical?

Newborns prefer to look at facelike stimuli, whereas a two month old most likely will prefer the facial features of

What will be an ideal response?

Which of the following is NOT a major type of scientific research?

a. naturalistic observation b. experiments c. correlational studies d. hypothetical studies e. clinical observation