What is an advantage of using a hormonal implant? it is easily inserted in the vagina. it is a 100 percent effective method of birth control. it reduces the likelihood of contracting an std. it can prevent pregnancy for as long as four years.

The answer is; It can prevent pregnancy for as long as four years

They retain their efficiency for four years without requiring any further intervention. This way, the subject has the luxury to forget about birth control after the implant and does not need to remember taking any pills. It is important to note that contraceptives do not prevent sexually transmitted infections and neither method is 100 efficient.

it can prevent pregnancy for as long as four years

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