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The Earth’s atmosphere is important to living things because it protects organisms from the suns harmful ultraviolet radiation. It also provides oxygen for humans and animals to breathe, and carbon dioxide for the plants.
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D. it takes millions of years to form
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Hemoglobin, or red blood cells, are primarily transporters of oxygen. These cells receive oxygen as air is breathed in through the lungs. Oxygen binds itself to these cells, which then carry it to the heart. The heart circulates the oxygenated blood to cells throughout the body in the process of cellular respiration.
Explanation:
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Which cell organelles are involved in the process of endocytosis? Which process is occurring when a vesicle fuses with the cell membrane and releases its contents outside the cell? What is the term for the diffusion of water across a semipermeable membrane? A. concentration gradients. C. energy from the cell.