The ecosystem has been the correlation between the biotic and abiotic components in the specified area.
The cardiovascular system has been the organ system comprising heart, arteries and veins. It functions to carry blood.
Cycling of water, nutrients, and blood
The water and nutrients in the ecosystem are absorbed and converted to another form and return to the original form. This has been known as the cycle of the water.
The water in the stream and ocean has been converted to the vapor form. It has been evaporated by the energy of sun.
The evaporated vapors have been converted to the clouds by condensation, and the precipitation results in the poring of water again to the stream and ocean.
The circulation in the body has been mediated in the same way as the water cycle. The blood has been pumped from the heart.
The veins carry the blood to different tissues and cells. It has been used, and carried back from the cells to the heart.
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