Cell theory and needle: what they have in common

1. Step 1. Cell theory — uses — Microscope. Observing cells.
2. Step 2. Microscope — evolved from — Glasses. Spectacle makers assembled the first microscopes.
3. Step 3. Glasses — has part — Spectacle frame. A frame.
4. Step 4. Spectacle frame — is made of — Bone. The first frames were made of bone and horn.
5. Step 5. Bone — is material for — Needle. The first needles with an eye were carved from bone.

Open Evothings