They were an advancement on writing and with with writing made making trades and agrements with diffrent areas easier
For aquatic ecosystems, these factors include light levels, water flow rate, temperature, dissolved oxygen, acidity (pH), salinity and depth. (Light level is an important factor in aquatic ecosystems.)
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the people that lived in soviet russia felt there government wasnt supporting them enough and they were tired of living a democracy
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Congress and the Supreme Court
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It compares production numbers of one product to another.... hope this helps
