Your lab team mixes dry baker’s yeast with warm water and divides the mixture between two test tubes. You add 5 grams of sugar to one test tube but nothing to the other tube. A small balloon is placed over the mouth of each test tube. After 30 minutes your team records the following observations. Yeast and warm water: The water is cloudy after a minute. After 30 minutes the yeast is settled to bottom of tube, water is less cloudy.

Yeast, warm water and sugar: Thewater is cloudy, a few bubbles have formed on top of the water. After 30 minutes the water is cloudy, lots of bubbles in the test tube, balloon has inflated some.

What is the BEST inference you could make about the yeast based on the data?
(4 Points)

The yeast needs warm water to grow.

The yeast bubbles when it contacts sugar.

Yeast is a living organism that uses sugar for energy.

Yeast is not a living organism because it did not change when added to water.