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Which is not a major similarity or difference between freshwater and marine ecosystems? i believe its b
a. both support a large number of plants and animals adapted for aquatic living
b. ocean and freshwater system conditions generally remain constant throughout the year
c. freshwater ecosystems have a very low salt concentration, and include ponds, lakes, streams, wetlands, and rivers
d. saltwater ecosystems have a high salt concentration and include oceans, coral reefs, and estuaries
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