Psychology as teens mature, the growth of myelin facilitates a. the birth of new nerve cells in the hippocampus. b. feelings of attraction toward those of the opposite (or the same) sex. c. communication between the frontal lobes and other brain regions. d. the development of impulsive risky behaviors.

I would go with B because most times when kids start to feel attracted to males/females, that happens while the teen is maturing.

to prevent people from getting the ebola virus, countries around the world paid to doctors develop a new vaccine. now that the vaccine has been made, doctors will need to experiment on a large number of people to find out if it works safely.

what is the greatest limitation that scientists are dealing with as they try to figure out how to experiment with the ebola vaccine?

meditation is a practice of sitting still and quiet for minutes or even hours. it has been practiced for thousands of years and is even a part of religious practices for some people. carefully controlled, repeated measurements of brain activity have shown that meditation does increase certain chemicals in the brain and even grows the part of the brain that people connect with their current surroundings and activities.

are claims about the effects of meditation most likely scientific or pseudoscientific?

not pseudoscientific, because people have made claims about it but scientific observations have not been made