Pleistocene age also knwon as the Ice age. Thereafter, there are many accounts that happened that lead to global warming. One that is true is Global warming began 18,000 years ago as the earth started warming its way out of the Pleistocene Ice Age, B is also correct as well. Forests have also returned but sea levels in fact rose to about 300 feet. Answer then is C.
There are so many examples for that in different areas, like alkyl silane experiment carried out in our lab recently.
Here's one link: http://www.alfa-chemistry.com/products/alkyl-silane-29.htm
Permafrost layer in Tundra is the layer of earth beneath the topsoil that remains frozen during the year and is usually only a few feet beneath the surface. It prevents trees from growing in the tundra because trees need to have deeper roots plus they cannot grow in the frozen ground.
Biome plants are : shrubs, sedges, mosses, lichens, grasses, and some flowering or herbaceous plants.

Each anterior root and its corresponding posterior root unite within the <u>intervertebral foramen</u> to become a spinal nerve.
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Answer: The liver regulates most chemical levels in the blood and excretes a product called bile.
Explanation: