Question

Cats have many different cells in their bodies * Cells come from existing cells The cell is the basic unit of life All living things are made up of cells Cells take in and use energy

Answer 1

By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.