Yeast is placed into a Ziplock bag with warm water and sugar and sealed so no oxygen will enter the bag overnight the bag swells up from what gas give it off by the yeast

The growing yeast gives off carbon dioxide gas.

Explanation:

Ancient Egypt first use this idea of growing yeast.

Growing yeast like to eat sugar,starch.

When they eat these food materials,they release a gas called carbon dioxide gas which gradually forms lots of tiny bubbles.

Using this idea, bread is made.As it form tinny bubbles in the bread dough,it pop during the time of baking and leaving tiny holes.

So for their growth and development,water and sugar is an important factor.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

the answers are a and c