Where are instructions for traits found? A. On chromosomes

B. On the nucleus

D. On genes

C. On the cell walls

Isotopes of the same element have differ in their

Resperation is a way to release carbon back into the atmosphere

Which example best describes a reflex action? a. eating food when hungry b. coughing when the throat is irritated c. bending down to lift a heavy object d. going for a walk outside