Answer:Ana is trying out a new cookie recipe and wants to see if the type of sugar affects the texture. She makes three batches of cookies and changes the type of sugar in each batch.a. Independent Variable: The type of sugar used in each batch.b. Dependent Variable: The texture of the cookies.c. Two Things That Must Remain Constant:The other ingredients used in the recipe (flour, eggs, butter, etc.).The baking conditions (oven temperature, baking time, etc.).