Test and control lines on a strip and oil lamp: what they have in common

1. Step 1. Test and control lines on a strip — is part of — Pregnancy test. Antibodies colour the lines.
2. Step 2. Pregnancy test — uses — Capillary action. Capillary flow of the liquid.
3. Step 3. Capillary action — is used in — Wick. Fuel rises up the wick by capillary forces.
4. Step 4. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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