Answer:
All the red birds in an area
Explanation: population is just the amount of people in an area. For example, Santa Maria has a populaton of 2,000 people. That means there are 2,000 people in Santa Maria
It is called surface currents.
I'd have to say gas because it usually doesn't change at all
I think glass does. or maybe a glass prism.
The answer is: Younger
Have a nice day/night