Which best describes arteries and veins? O Both have valves.

O Both are thick, muscular, and elastic.

O Arteries carry blood back to the heart; veins connect arteries and capillaries.

O Arteries carry blood away from the heart; veins carry blood back to the heart.

both have valves

Explanation: The answer to the question is both have valves. Arteries are not thick and elastic. Veins are connected by arteries, they do not connect arteries. Arteries carry blood away from the heart; veins carry blood back to the heart. This is false because arteries are like smaller versions of veins.

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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

answer; (false);