What percentage of salinity do saltwater biomes have?

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Multiple Choice

What percentage of salinity do saltwater biomes have?

Saltwater biomes have a salinity of about 3.5% by weight, which is roughly 35 parts per thousand. This is the standard average for seawater and explains why ocean life is adapted to that salt concentration. Among common classroom estimates, 3% is the closest approximation to the real value, while the other options are noticeably farther from typical seawater salinity. Freshwater and brackish waters fall well below this level, and 10% would be much saltier than most oceans.

Saltwater biomes have a salinity of about 3.5% by weight, which is roughly 35 parts per thousand. This is the standard average for seawater and explains why ocean life is adapted to that salt concentration. Among common classroom estimates, 3% is the closest approximation to the real value, while the other options are noticeably farther from typical seawater salinity. Freshwater and brackish waters fall well below this level, and 10% would be much saltier than most oceans.

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