What is a risk?
a. the degree of probability or likelihood that something will happen
b. a chance a person takes without knowing what the outcome will be
c. dangerous chances of injury or loss
d. all of the above

D

Explanation:

A is correct because a risk could be good or bad. For example, entering the lottery is a risk because you could lose a lot of money but a small group of people make a lot of money from winning the lottery.

B is correct because when someone enters the lottery, they do not know their outcome until later.

C is correct because speeding is risky because it is easier to loose control of the car when driving fast.

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