Friction, gravity, air resistance etc
Infrastructure, because it's not a part of the environment, it's not a form of transportation, not a service either. Thus the only remaining answer is Infrastructure
The sensory neurons are afferent
The motor neurons are efferent
A person who smokes about 1.5 packs daily gets 200 hits of nicotine to the brain each day.
b. 200
Answer: A. True
Explanation: It boosts your mood and relieves stress.
