AP BIOLOGY

Detailed explanation-1: -Oceans. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth’s surface. Like ponds and lakes, the ocean regions are separated into separate zones: intertidal, pelagic, abyssal, and benthic. All four zones have a great diversity of species.

Detailed explanation-2: -This biome also dives beneath the ocean surface to the very bottom of the deepest ocean trench. As the largest biome, the open ocean covers over 45% of Earth’s surface. But compared to the coast, the open ocean is sparsely populated, almost like an ocean desert.

Detailed explanation-3: -Aquatic biomes in the ocean are called marine biomes. Organisms that live in marine biomes must be adapted to the salt in the water. For example, many have organs for excreting excess salt. Marine biomes include the oceans, coral reefs, and estuaries (Figure below).

Detailed explanation-4: -Aquatic biomes are divided into marine and freshwater biomes based on salt content. Marine biomes are further divided into coral reefs, seas and ocean biomes, and estuaries biomes. Freshwater biomes are lakes and ponds, rivers and streams, and wetland biomes.