Phosphorylation of ADP to ATP occurs A. via ribosomes on the endoplasmic reticulum.

B. in the nucleus

C. in the mitochondria

D. within the cell membrane

Abay where the river empties into the sea

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.