Ancient history

What did Schwann conclude in 1839?

In 1839, Theodor Schwann concluded that all plants and animals are made up of cells. This conclusion was based on his observations of a wide variety of organisms, including plants, animals, and protists. Schwann's work helped to establish the cell theory, which is one of the most fundamental principles of biology.

The cell theory states that all living organisms are composed of cells, that cells are the basic unit of life, and that all cells arise from pre-existing cells. Schwann's work helped to establish the third part of the cell theory, which was not widely accepted until the 1850s.