Helpful in Food

Cite yogurt, cheese, and bread as evidence.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 39

Here's a claim: some microorganisms are helpful. Evidence number one is in your kitchen.
Bacteria thicken milk into yogurt, and they help turn milk into cheese. They also give these foods a sour taste.
Yeast feeds on sugar in bread dough and gives off gas. The bubbles make the dough rise, and they leave little holes in the bread.
Try it with a grown-up: mix yeast, sugar, and warm water in a bottle, and stretch a balloon over the top. Watch what the gas does.

Georgia Standards of Excellence in Science:

S5L4.a — Construct an argument using scientific evidence to support a claim that some microorganisms are beneficial.