Answer:
During DNA packaging, long pieces of double-stranded DNA are tightly looped, coiled, and folded so that they fit easily within the cell. Eukaryotes accomplish this feat by wrapping their DNA around special proteins called histones, thereby compacting it enough to fit inside the nucleus
Radioactivity due to heavy elements
Friction caused by earths fast rotation
In a chemical reaction, a reactant bonds to an enzyme at a region known as the Active Site.