When an organism consumes another organism below it in the energy pyramid, it only gets % of that organism's energy. (This is because the rest of its energy is spent just taking care of itself and staying alive.)

b.

the correct answer to this question is #5

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.