How many states in the world are there?

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

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

What is the angular momentum of the bar about the axle?