Answer
Matthias Schleiden and Theodor Schwann were contemporary scientists. Schleiden was a botanist and Schwann was a zoologist. They had access to microscopes that were greatly improved biological instruments over those microscopes used by Hooke and Van Leeuwenhoek. These improved images provided more realistic pictures because the improved lenses minimized blurriness ( spherical aberration) and color distortions( chromatic aberrations).
Work Step by Step
Based on their examinations of many kinds of animal and plant materials, Schleiden and Schwann came to the common conclusion that all living organisms are composed of cells. The cell theory is considered the most important concept in biology and biomedical sciences. All the life processes are today interpreted as cellular activities. The work of Schleiden and Schwann, and of others in their era and after them, made invaluable contributions to this fundamental understanding of the structural basis of physiological processes.
