Yeast and davy lamp: what they have in common

1. Step 1. Yeast — is material for — Bread. A raising agent that releases carbon dioxide.
2. Step 2. Bread — uses — Oven. Bread is baked in an oven.
3. Step 3. Oven — is made of — Clay. Baking ovens were shaped from clay.
4. Step 4. Clay — is material for — Oil lamp. Later — clay ones.
5. Step 5. Oil lamp — has part — Wick. The wick feeds oil to the flame.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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