The right option is; Hooke
Robert Hooke was an English scientist that first recognized the cell as the universal unit of life. In 1665, Robert Hooke observed honeycomb-like structure when he viewed very tiny slices of cork using a coarse compound microscope. He called the structures cells but he did not know their actual structure and function.
2019 years have humans been on earth
Because unlike nonflammable materials, wood still has the ability to burn.
That process is called Fermentation.
