The tundra biome is the coldest and one of the largest ecosystems on Earth. It covers about one-fifth of the land on the planet, primarily in the Arctic circle but also in Antarctica as well as a few ...
Imagine a mammoth, grazing 20,000 years ago in the steppe-tundra—a vast and frigid grassland where plants grew slowly under a frigid, low-carbon atmosphere. The mammoth tramples saplings, reducing ...
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