1. Label three bottles.
A – yeast, warm water and sugar
B – yeast, warm water
C – yeast, sugar
2. Put the ingredients in each bottle.
3. Put a balloon over the neck of each bottle.
4. Put the bottles in a warm place and Wait 20 minutes.
1. The balloon on bottle A inflated the most.
2. The balloon on bottle C inflated the least.
3. Yeast needs sugar and water tu carry out nutrition.
Podeu veure més imatges.