Which statement correctly describes compounds? Compounds cannot be broken down into simpler substances by chemical means. Each compound is composed of one type of molecule. Compounds can be broken down into simpler substances by physical means. Each compound is composed of one type of atom.

Acommon kind of mechanical weathering is called

Give an example of a trait that is controlled by more than one gene.

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases