Chlorophyll is the substance which makes green plants green. The chlorophyll molecule has the unique capacity to convert the energy of the sun into chemical energy (through photosynthesis), which the plant uses to make carbohydrates from carbon dioxide and water, and as a byproduct, furnish the earth with oxygen.
Ultimately, all living things—plant and animal—derive their energy, and therefore their life, from solar energy through photosynthesis.
Hemoglobin is the substance in human blood that carries oxygen from the lungs to the other tissues and cells of the body.
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