Paragraph Three 　When infants 18 months old see an unrelated adult whose hands are full and who needs assistance opening a door or picking up a dropped clothespin, they will immediately help. The helping behavior seems to be innate because it appears

Paragraph Three 　When infants 18 months old see an unrelated adult whose hands are full and who needs assistance opening a door or picking up a dropped clothespin, they will immediately help. The helping behavior seems to be innate because it appears so early and before many parents start teaching children the rules of polite behavior. 38. Human beings may be b____ with the urge to help.

birth