was introduced in 1838 by 3 scientists named Matthias Schleiden, Theodor Schwann, Matthias Schleiden. The cell theory is composed of 3 sections
1. Cells are the smallest thing in life
2. They make up everything
3. All cells come form existing cells ( they reproduce into more cells)
Differences between multicellular and unicellular organisms
The difference between the multicellular and the unicellular is that a unicellular contains no nucleus and only has one cell therefore the name uni celler and the multicellular contains more than 1 cell and has a nucleus.