A star will attract other objects (such as another nearby star, or a planet) gravitationally; in turn, according to Newton's Third Law, it will also be affected gravitationally by the other object. That is, if star "A" attracts star "B", then star "B" will also attract star "A".
Neither. Gravity is a property of any object with mass.
Pyruvic acid enters and carbon dioxide exits.
The hydrogen in water causes the speed of light to slow down. When it exits, the air and gravity cause it to speed up again. It gets the energy from gravity.
the bladder
The cell membrane
The Cell membrane.
THEY DON'T.
Stomata.
controls what enters and exits membrane by using proteins
anywhere anyhow anyway anywhen head
Water enters and exits a cell by osmosis, which is the diffusion of water.
the cell membrane.
The cell membrane regulates what enters and exits the cell.