Darwin Believed That Emotional Expressions Began as __________ That Came

Darwin believed that emotional expressions began as __________ that came to have evolutionary value because they __________.

A) physiological reactions; convey emotional states to other members of the species
B) physiological reactions; increased the efficiency of bodily reactions
C) communication devices; increased the efficiency of bodily reactions
D) random mutations; convey expectations to other members of the species

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