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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.

When you have proper posture, your back is arched. a. true b. false

per vehicle mile, motorcyclists are times more likely to die in a crash than passenger car occupants.