What characteristic about the tundra biome listed below does not contribute to a reduction of carbon dioxide on earth?
a.
nutrient-poor soil
b.
permafrost
c.
plants and their trapped carbon dioxide are frozen in the earth
d.
carbon dioxide sink

b.  permafrost

Explanation:

Permafrost is known as frozen earth and can have different characteristics and shapes. They can be rich organic soils or they can be sandy and rocky. They could even be solid rock

When the earth is frozen, many interesting things happen. The earth can be covered with patterns of circles, polygons or stripes, which is known as patterned earth, which forms as the earth freezes. Trees can be scarce and distanced from each other, and their roots cannot penetrate solid earth, leaving only the short tundra plants or complete absence of plants. The characteristic hills of this landscape, known as pingos, practically formed by ice underground, appear in the landscape, gaining size as more ice is added to the core. In areas known as block camps, large blocks of ice can also appear from what was once flat land and was forced upward, like loose pieces of a puzzle that are pushed underneath.

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