B: Cells are the basic operating units of living organisms.
Answer:
space between gas molecules
Explanation:
as the altitude increases the air density decrease because of weaker gravity and these led to more distant of air molecule and the space between gas is increased
Nicolaus Copernicus was a Renaissance mathematician and astronomer. He was the first to formulate a comprehensive heliocentric cosmology with the Sun, instead of the Earth, as the center of the Universe. The distance of the planets from the sun was in direct relationship to the size of their orbits.
Humans and chimps genes may have split 13 million years ago.
