There they go again. That's how they are when they learn something new from class.
Woah! I didn't know that Anton Van Leeuwenhoek was the first to observe living cells.
Yeah! But it was Robert Hooke who coined the word "Cell"
Matthias Schleiden said that plants are aggregates of fully individualized, separate beings.
Theodore Schwann said animals are also made of cells and proposed a cellular basis of life.
While Rudolf Virchow said that animals arise only from an animal, and plants only from a plant.
The combined work of those three is known as the cell theory. It consists of the three following principles. 1. Cells are the basic unit of life. 2. All organisms are composed of cells. 3. All cells arise from preexisting cells.