Carbon Sinks, Carbon Sources, and Release Agents

Three examples of carbon sinks are: shells, trees, and if you were at a funeral.
Three examples of carbon sources are: driving to school, making toys, and
burning fossil fuels. Some carbon sinks could be bad, because they make
pollution in the air which is bad for the environment. Three example of
release agents are: volcanic eruptions, deforestation, and jumping rope.

Endangered Species Links

Why polar bears are endangered :( -

http://www.nwf.org/Wildlife/Wildlife-Library/Mammals/Polar-Bear.aspx

How to save the endangered species :) - http://www.endangeredspecie.com/Ways_To_Help.htm

Food Chain and Food Web

A food chain is the chain of organisms eating other organisms. This chain gives organisms energy to live. For example, the sun helps lichen produce glucose for food, and the lichen gets eaten by the caribou. The caribou gets tired and takes a nap and an arctic wolf attacks the caribou and eats it. The arctic wolf gets old, and he just collapses. The moss decomposes the arctic fox and gives plants nutrients.

If primary consumers became extinct many activities can happen.There will be an over increase of producers, because there are no animals to eat the plants. There will also be a decrease of secondary consumers, because they have nothing to eat unless they are a omnivore. Lastly, there will be less dead carcasses, because there are no primary consumers. Which means there will also be less scavengers.

Scavenger

A scavenger is an animal that eats dead plants and animals A type of tundra scavenger is an Arctic Fox.They will eat small animals such as voles and lemming, but mainly they follow polar bears and eat dead carcasses of animals. They eat the remains of what the polar bear had killed.

Producer

A producer is a living organism that makes its own food through photosynthesis. One producer in the tundra is lichen. Lichen is basically algae and fungi in one plant. They usually grows on rocks, but the strange part about it is that they don't need soil to grow. They are usually eaten by caribou in the winter.

Primary Consumer

A consumer is an animal that eats plants also called a herbivore. Caribou are from the deer family. They have thick and hollow hairs, which helps them keep warm. They move across the Arctic usually in large herds. They eat plants. For the winter they go into the forests, so the trees will give protection from the wind and snow. In the spring the caribou leave the forest and go to the tundra for there calves to be born.

Secondary Consumer

Secondary Consumers are carnivores that feed on herbivores. Polar Bears are the world's largest land animal. They can be found in the Arctic, Canada, Russia, United States, Norway, and Greenland. These countries have banned killing polar bears, because they are almost going extinct. Ice is melting because of global warming, also there are going extinct since they are top of the food chain. Since they are on the top of the food chain the toxin accumulates into their body. They like eating seals but they eat other animals, too.