What inventions revolutionized american life in the late 1800's

Which of the following is true of emotions? (a) a neurologically-intact baby can show at least six distinct emotions at birth. (b) the character of emotions changes as we develop cognitively. (c) basic emotions are culturally- and developmentally-based. (d) in general, adults cannot interpret infant emotions until the infants are 10 to 12 months old.

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?