A man is running 80 m North and then runs 100 m East. The magnitude of the man’s displacement is 180.0 m
13.4 m
128.1 m
18. 3m

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

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