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Building and repairing cells
The percent abundance of each isotope tells you how many of each kind of isotope exist one very 100 particles. Relative abundance is the percent composition of an organism of a particular kind relative to the total number of organisms in the area. Hope this helps.
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chloroplast is where photosynthesis takes place, and mitochondria stores and releases the energy, it's like having a battery but no cord to charge anything
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the answer is Breaking down of rock into sediment hope this helped
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