The various spaces where the internal organs in the body reside.

The answer is Cavities.

Explanation:

The body cavities are the spaces within the human body that help us protect, separate and sustain the internal organs. There are different cavities in the body of the human being, where the largest is called the abdominal cavity, which provides space for a large number of organs, such as the kidneys, liver and stomach, among others. Other cavity present in the human body are the cranial cavity, where the brain is located.

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