Jeans and submarine: what they have in common

1. Step 1. Jeans — has part — Rivet. Copper rivets on the pockets.
2. Step 2. Rivet — is part of — Plate armour. Movable plates on rivets.
3. Step 3. Plate armour — evolved into — Armour. Armour moves from people to machines.
4. Step 4. Armour — is part of — Tank. Armour protects the crew.
5. Step 5. Tank — has part — Periscope. Observation devices.
6. Step 6. Periscope — is part of — Submarine. A periscope.

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