This is known as active transport and ATP supplies the energy currency. This type of transport involves cell organelles known as vesicles. In vesicular transport, vesicles allow large molecules to exit the cell because the vesicle fuses with the plasma membrane and its contents spill out. This is called exocytosis.
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Animals don't have to compete for it
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Answer:
Layers of the atmosphere. The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere. A further region at about 500 km above the Earth's surface is called the exosphere.
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<span>vasoactive intestinal peptide</span>
