Empty space; an atom consists of a dense, positively charged nucleus surrounded by a "cloud" of negatively charged electrons
The body produces Buffers that can neutralize acids
The answer is D. When you melt something, it only changes its physical change.
Kinetic energy is equal to half of an objects mass multiplied by the velocity squared.
I would say that it is Meteors, Meteorites, and comets. (METEORS may be wrong)