Asubtances that is made up of only one kind of atom is of atom is

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

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

What are some properties of transverse waves?