When an object vibrations causes another one vibrating?

If babies are consistently placed on their backs without any restrictions, what will happen to their development? a. they suffer from weakness in certain muscle groups. b. their ability to roll over, crawl, and eventually walk is hindered. c. they suffer brain damage from the pressure on the back of the head. d. they learn to roll over, crawl, and eventually walk on their own.

The presence of aids in a community often increases its level of property what is one of the main reasons for this

Which method will provide the most emotional support in a new exercise program