LIFE SCIENCE

Detailed explanation-1: -Estuaries are home to unique plant and animal communities that have adapted to brackish water-a mixture of fresh water draining from the land and salty seawater. However, there are also several types of entirely freshwater ecosystems that have many similar characteristics to the traditional brackish estuaries.

Detailed explanation-2: -Boreal Forests and Arctic Tundra The soils of the Arctic tundra may remain in a perennially frozen state referred to as permafrost. Notable animals in the Arctic tundra include caribou (reindeer ), musk ox, arctic hare, arctic fox, snowy owl, lemmings, and polar bears.

Detailed explanation-3: -The pelagic zone is generally cold though it is hard to give a general temperature range since, just like ponds and lakes, there is thermal stratification with a constant mixing of warm and cold ocean currents. The flora in the pelagic zone include surface seaweeds.