These sunflower seeds have sprouted and are growing tall The seeds need energy to grow. The seeds can make their own food using water, carbon dioxide and
The end result is sugar or glucose that plants use as food,
A)
air
B)
soil
oxygen
D
sunlight

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.