The main reason that family and friends are frequent targets of aggression is that

a. as obstacles, they're unremovable (x)
b. they're convenient(√)
c. they cause the most frustration (x)
d. frustration-producing obstacles are unclear (x)

the answer is b (they're convenient) because they are more likely to forgive you and not stay angry at you

In multiple sclerosis, the immune system destroys the substance that coats and protects nerve fibers in the brain and spinal cord. this causes inflammation and injury to the nerves, and the axons don't conduct impulses as well.

Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.

The 1.5 mile run test and the 12 minute swim test are considered as what kind of test ?