Explain the cell theory and the rolls robert hooke , theodore schwan and matthias schleyden played in the development of this theory

The cell theory consists of the following all living things are made up of cells, cells are the basic unit of life, and and new cells come from pre existing cells. Hooke looked through a microscope and saw that living things were all are made up of cells, which then lead Theodore to study animals and realize that the tiny cells are the basic unit of life. And lastly Matthias Schleyden studied animal cells and their internal makeup.

Try a? sorry if i’m wrong

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.