AP BIOLOGY

Detailed explanation-1: -1) Marine biomes generally have salt concentration that average 3% . 2) Freshwater biomes have salt concentration less than 1% .

Detailed explanation-2: -The aquatic biome is divided into freshwater and marine regions. Freshwater regions, such as lakes and rivers, have a low salt concentration. Marine regions, such as estuaries and the ocean, have higher salt concentrations.

Detailed explanation-3: -Marine biomes usually contain salt concentrations that average about three per cent, while freshwater biomes have less than one per cent of salt concentration.

Detailed explanation-4: -A lake at Acadia National Park, Maine. Freshwater is defined as having a low salt concentration-usually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e., ocean).