A marsh ecosystem has a gross primary production of 17,500 kcal/m2 per year. If the energy
used for autotrophic respiration is 8,500 kcal/m2 per year, what is the net primary production
in this ecosystem?

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

straight or amphibians are homeothermic to thermal