Radio and rope: what they have in common

1. Step 1. Radio — is part of — Sputnik 1. It sent out a “beep-beep” radio signal.
2. Step 2. Sputnik 1 — uses — R-7 rocket. Launched by an R-7 rocket.
3. Step 3. R-7 rocket — evolved into — Soyuz. The Soyuz rocket belongs to the R-7 family.
4. Step 4. Soyuz — has part — Parachute. Landing by parachute.
5. Step 5. Parachute — has part — Rope. The lines are ropes.

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