1-The scientist provided evidence for the Cell Theory.
2-The microscope was needed before the Cell Theory could be developed.
3-The three scientist that directly contributed were Robert Hooke, Rudolf Virchow, and Anton van Leeuwenhoek.
4-the earlier scientist affected the later scientist by adding something which later another scientist tested that and found a different thing to add to the Cell Theory.
5-All living things are composed of cells, all cells come from other cells, and the cell is the smallest form of life.