U will be marked as brainlest if u solve this!! Plz help!
I need answers from 3 to 6​

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

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n