Answer:
B
Explanation:
When air is heated, it expands and rises.
My guess is A. I'm not 100% positive but i'm pretty sure.
Answer:
I think milligram is the correct answer.
That would be gravitational force. Check out creation.com. Search up "star-formation" in their search bar. Hope this helped.
Answer:
Explanation:
As the paint brush is dropped from the top of a tall ladder it started free falling
i.e. velocity of brush increases as it falls down due to the acceleration provided by gravity.
We know acceleration due to gravity is the attraction experienced by the object due to earth attraction
Value of acceleration due to gravity is constant i.e. 
Therefore the correct choice is
velocity is increasing and acceleration is constant