1. Macromolecules are the biological molecules necessary for life. Cells need macromolecules for different functions from energy storage to membrane transport Each class of macromolecule serves a different function. Which macromolecule would serve as an energy source for the cell and is used as a component in the cell wall of plants ? A. Carbohydrates
B. Lipids
C. Nucleic Acids
D. Proteins
(NEED HELP ASAP PLEASE)

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.

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