Me i need the answer
which statement best completes the following sentence?
one advantage of a federation is but one disadvantage is (3 points)
a. citizens can participate at multiple levels of government; the national government may be too weak to provide services
b. citizens can participate at multiple levels of government; overlapping national and local services may be wasteful
c. power is concentrated on the national level; the national government may not be aware of local issues
d. power is concentrated at the local level; the local government may not be able to cooperate on national issues

The romans believed every human being deserved rights, even slaves. true or false

For each of the six basic tactics, select the set of action steps (a to f) that describe the tactic. answers

It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. in fact, however, simply talking to other people—that is, participating in social interaction, which engages many mental and perceptual skills—suffices. evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills. which of the following, if true, most seriously weakens the force of the evidence cited? (a) as people grow older, they are often advised to keep exercising their physical and mental capacities in order to maintain or improve them. (b) many medical conditions and treatments that adversely affect a person's mental sharpness also tend to increase that person's social isolation. (c) many people are proficient both in social interactions and in solving mathematical problems. (d) the study did not itself collect data but analyzed data bearing on the issue from prior studies. (e) the tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation.