Multiple choice question
what happens when molecules slow down?
when molecules slow down they spread
apart.
when molecules slow down they get
closer together.

Compare and contrast physical changes with chemical changes.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Consider the story you just read. all but one of the choices below indicate that something is living.