Francine is developing a model of the carbon cycle, which involves the movement of carbon among various Earth systems. She begins by drawing the diagram shown below. In addition to the movement of carbon through Earth’s systems, Francine also wants her model to show how much carbon is stored in reservoirs or sinks. Which of these aspects of the carbon cycle could she add to her model to start building a more quantitative model? A. The process of photosynthesis moves carbon from the atmosphere to the biosphere.
B. About 550 gigatons of carbon is stored in plant biomass.
C. The ocean is the greatest carbon sink, storing about 38,000 gigatons of carbon per year.
D. Geologic processes such as eruptions move carbon from the geosphere to the atmosphere.

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.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.