Two babies that come from different fertilized eggs may be
A. siblings.
B. dizygotic twins
C. unrelated
D. all of the above
D
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At later stages of the neuron's development, neurotrophins ____
a. increase the branching of axons b. cause the neuron's death c. become converted into myelin d. connect the axon to axons of adjoining cells
A nonspecific risk factor for substance use is ____
a. being involved in several hobbies b. high level of engagement with school c. perception of oneself to be physically less mature than same-age peers d. having friends with positive attitudes about substance use
If Ethan experiences a big jolt of cortisol due to a stressor late in the evening, how will his sleep likely be affected?
a. ?He will sleep heavily and have difficulty waking up. b. ?He likely will have difficulty falling asleep and may wake frequently during the night. c. ?He will sleep lightly but soundly. d. ?He will fall asleep promptly but may wake frequently during the night.
Close relationships
a. take a lot of time and energy to maintain. b. are related to well-being, happiness, and health. c. are related to abuse, deception, and break-ups. d. are all of these.