Oar blade and micrometer: what they have in common

1. Step 1. Oar blade — is part of — Oar. The flat part in the water.
2. Step 2. Oar — is part of — Boat. A boat was moved by oars.
3. Step 3. Boat — evolved into — Sailing ship. Sailing ships grew out of rowing boats.
4. Step 4. Sailing ship — has part — Anchor. An anchor.
5. Step 5. Anchor — has part — Shackle. The chain mount.
6. Step 6. Shackle — is part of — Micrometer. A rigid frame.

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