Marissa's target heart rate zone is 140-178. during a tennis match, she checks her wrist monitor, which indicates that her heart rate is currently 130. which of the following will her get the most productive workout, based on the information she has gathered? moving more quickly and serving the ball with greater intensity moving more slowly and serving the ball with less intensity deliberately trading points to change the duration of the match deliberately shortening the duration of the match to play less

answer is B

Explanation:

you cant go faster or slower must have the right speed

answer; i believe the correct answer is (progesterone);

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