Small molecules, such as oxygen and carbon dioxide, pass through membranes by a process called

The process if called Diffusion! Explanation: If the molecule is so small like carbon dioxide, this process does the trick. When the concentration of O2 outside the cell is higher than inside, O2 molecules diffuse in, passing through the membrane like it isn't even there.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.