what is fossilisation?

Explanation

The process of formation of fossil in the rocks is called fossilization.
(ii) Mutation is defined as the sudden heritable change in the nucleotide sequence of DNA in an organism. It is the process by which genetic variation are created which intum brings about changes in the organisms. The organism which undergoes mutation is called a mutant The factor which induce mutations are known as mutagens. Mutagens are of two types
(a) Physical mutagens such as X rays, `alpha` `beta`  `gamma`.. y rays, UV rays, temperature etc.
(b) Chemical mutagens such as mustard gas and nitrous acids. The utilisation of induced mutation in crop improvement is called mutation breeding
Achievements of mutation breeding:(a) Sharbati sonora, wheat produced from sonora - 64 by using gamma rays.
(b) Atomita 2 rice with saline tolerance and pest resistance,
(c) Groundnuts with thick shells.