Biology / Unit 14 Bio 3501 short lesson, about 20 seconds
Aquatic Biome Classification by Salinity and Zone
Captions available
The idea
Aquatic biomes classify by salinity into freshwater and marine systems, and within each by zone — the depth light and nutrients define, such as an ocean's intertidal, photic, and aphotic zones.
In practice
The photic zone supports photosynthesis; the aphotic zone below receives no usable light.
Where people slip
An aquatic biome's zone, not salinity alone, determines which adaptations residents need.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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