Forensic science explain where a person's dna comes from.

The nucleus, which is in a cell. the nucleus acts like a control center. small parts of DNA can also be found in the mitochondria but the majority is located inside the nucleus of every cell

Ithink due to shortage of water

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.