#4 plsss student's combined baking soda and vinegar to demonstrate a chemical reaction. what indicates that a chemical reaction occured?

The answer is A, the formation of bubbles

Explanation:

Whet the reaction occurs it creates gas causing bubbles to form showing that a chemical reaction has occurred.

explanation:

the sun shines white and black light to our planet. the white light has all the colors in it. in our upper atmosphere, we have dust particles and oxygen molecules. the white light meaning all of the colors in a rainbow shines through the upper levels of the atmopshere and the blue light scatters across the entire planet. that is why our sky is blue.