7.What is the main function of the heart? to exchange gases
to remove waste materials from the body
to produce red blood cells
to move blood through the body

C or D

Explanation:

I'm not so good at but from what i've learned in school i would say one of those

Very sorry

you can't get pregnant from swallowing semen; the taste varies

explanation:

when you swallow semen it doesn't go into the vagina and fertilize the egg; for taste how ever that can be altered by what the man eats suck as pineapple can make it sweeter

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