Infantry fighting vehicle and lead–acid battery: what they have in common

1. Step 1. Infantry fighting vehicle — evolved from — Armoured personnel carrier. An armed APC.
2. Step 2. Armoured personnel carrier — evolved from — Tank. They appeared at the end of the First World War.
3. Step 3. Tank — has part — Periscope. Observation devices.
4. Step 4. Periscope — is part of — Submarine. A periscope.
5. Step 5. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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