Question

which discovery was the earliest step in the scientific development of the modern cell theory? aristotle discussed the idea of spontaneous generation. flemming used dyes to stain cells so they could be observed more clearly. hooke and von leeuwenhoek observed cells and tiny organisms with microscopes. schleiden and schwann published papers stating that plants and animals were made of cells.

Explanation:

Aristotle's spontaneous - generation idea is not directly related to cell - theory development. Flemming's staining was a later improvement in cell observation. Schleiden and Schwann's work was a more advanced step in formulating cell theory. Hooke and van Leeuwenhoek's microscopic observations of cells and tiny organisms were the earliest steps in the scientific development of modern cell theory as they first provided evidence of the existence of cells.

Answer:

Hooke and van Leeuwenhoek observed cells and tiny organisms with microscopes.