Photoresistor and petri dish: what they have in common

1. Step 1. Photoresistor — is a kind of — Resistor. A resistor.
2. Step 2. Resistor — includes — Heating element. A heater is a resistor designed to release heat.
3. Step 3. Heating element — is part of — Electric kettle. A heating element in the base heats the water.
4. Step 4. Electric kettle — evolved from — Kettle. A kettle with a heater.
5. Step 5. Kettle — has part — Pot lid. A cap.
6. Step 6. Pot lid — is part of — Petri dish. A cap.

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