Which of the following neurotransmitters affects neurons involved in voluntary movement, learning, memory, pleasure and reward, and possibly responses to novelty?

The widely accepted idea that a combination of a genetic risk and an environmental stress causes emotional disorders is known as gene-environment __________

No clue on this one, please help!

Worldwide, only about ______ percent of infants receive regular care from a nonrelative who is both trained and paid to provide care

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