A. Grass is eaten by a wren. The wren is eaten by a hawk. The hawk is eaten by a snake. B. Grass is eaten by a wren. The wren is eaten by a snake. The snake is eaten by a blue jay.
C. Grass is eaten by a grasshopper. The grasshopper is eaten by a snake. The snake is eaten by a blue jay.
D. Grass is eaten by a grasshopper. The grasshopper is eaten by a blue jay. The blue Jay is eaten by a hawk.

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explanation: bc blah

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.

which condition is a cause of impotency in men?

b. the inability of the penis to become erect