Energy, growth, evolutionary and ecological describe different biological life cycle. Life cycle involves all those living organisms in the earth. Life cycle involves energy that every living organisms need, growth that every living organism undergo, evolution and ecological.
As diatoms are made from silica this makes diatomaceous earth very abrasive, and so the sharpness enhances the particles as a pesticide. Diatoms are also useful in forensic studies. If a person has drowned then diatoms are able to enter the human body.
I think it is a petrified fossil but you didn't give any choices
