Answer:
D. atomic mass unit
Explanation:
The atomic mass unit is used for measuring atomic mass.
It depends on the facts and how they will change
I think the correct answer from the choices listed above is the third option. The barrel of a gun is also known as bore. The barrel is the metal tube which the bullet is fired and the bore is the inside of the barrel. It is the one closest to the barrel so it must be the answer.
ocean - Large bodies of water.
current flowing towards equator carry cold water from poles
current flowing towards away from equator carry warm water from poles
Example - Humidity
