Unicellular vs. multicellular, prokaryotic vs. eukaryotic — understand the building blocks of all living things.
All living things are made of cells — but some run the whole show with just one, while others are built from trillions working together.
| Feature | Unicellular | Multicellular |
|---|---|---|
| Number of cells | One cell only | Many cells |
| How it works | One cell does everything — eating, moving, reproducing | Cells specialize and work together in tissues and organs |
| Examples | Bacteria, amoeba, paramecium, yeast | Humans, dogs, trees, mushrooms, jellyfish |
| Cell type | Can be prokaryotic or eukaryotic | Always eukaryotic |
| Complexity | Simpler — single cell must handle all life functions | More complex — division of labor between cell types |
| Visible to naked eye? | ❌ Usually not | ✅ Usually yes |
Two major types of cells — the key difference is where the DNA lives.
| Feature | Eukaryotic | Prokaryotic |
|---|---|---|
| DNA location | Inside the nucleus | Floating in the cytoplasm |
| Has a nucleus? | ✅ Yes | ❌ No |
| Examples | Plants, animals, fungi, protists | Bacteria |
| Unicellular or multicellular? | Both possible | Always unicellular |
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