If your are breathless and unable to talk normally during exercise, you should immediately
a. stop and notify your doctor
b. drink more water
c. go inside to rest
d. lower your exercise level

The correct answer would be D.

If you are breathless to the point where you are unable to talk during exercise then you are clearly pushing yourself too hard and overdoing it. You need to lower the intensity of the exercise level and work at a pace that suits your body. Eventually over time you will build up stamina and your energy levels and you will be able to exercise at high intensities. You should never be breathless during exercise as you run the risk of passing out. Everything should be done in moderation when you exercise especially when you first start out.

answer; more than 80% percent of adults;

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