Answer:
Robert Hooke main contribution is the discovery of cell.
Step-by-step explanation:
Robert Hooke (1635-1703) is an English physicist. he was the first man who discovered cell by analyzing the cork. This discovery of cell leads the way for future knowledge about the structure of all living organisms. The contributions of Matthias Schleiden was that he was the first man who analyze the structure of plant cell while on the other hand, Theodore Schwann analyze the animal cell and proposed cell theory from that.