Yeast breaking down starch into usable energy law of thermodynamics. yeast converting 100 kcal of starch into 100 kcal of fat law of thermodynamics. yeast destroying energy when they break down fat law of thermodynamics.

Yeast breaking down starch into usable energy obeys the 1ˢᵗ  law of thermodynamics. Yeast converting 100 k cal of starch into 100 k cal of fat obeys the 2ⁿᵈ  law of thermodynamics. Yeast destroying energy when they break down fat violates the 1ˢᵗ law of thermodynamics.

Explanation

A yeast developing on a slice of bread breaks down starch releases 100 k cal of energy. Then this energy is used to manufacture and store 100 k cal of fat. When the yeast finally breaks down the fat, that energy is consumed and lost forever.