6ebbba77_Marine_habitats__principles__Living_in_the_sea
[Factor] Tides [Living on the land] Do not apply. Where the sea begins, all land life ends. While perfectly adapted to living on land, the land creatures have not ventured back into the sea, although some exceptions exist (mangrove, sea grass, dolphins, etc.) The intertidal zone is poor in land creatures. [Living in the sea] 
While perfectly adapted to the water world, creatures find the dry world impossible to live on. Yet some have found ways to survive out of the water for short or long periods. The intertidal zone is rich in sea creatures. Tides cause currents near the coast. These are important for sessile (attached) sea life.
Marine habitats, principles
Living in the sea