There are two things that activate the leavening agent. What are they?​

Leavening agent is a material that causes doughs and batters to expand by releasing gases from inside the mixture, resulting in porous baked goods. Air, steam, yeast, baking powder, and baking soda are examples of such agents.

Explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

po-215 i got it right on the quiz