1. Which phrase best describes an exothermic chemical reaction? A. does not absorb any energy
B. forms products with higher bond energy than reactants
C. is in a state of equilibrium
D. releases more energy than it absorbs

the correct answer is:

a population changes in response to a change in the environment.

the answers are a and c

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.