I would argue that it is stars as they are not on the earth...
Answer:E stabilization pond
Explanation: if he lives in a tundra biome its mostly populated my swamps and ponds so that would be the most useful one.
Answer: Scientists know that the Colorado River carved Grand Canyon. ... The age of the river falls between the rocks determined to be older than the river and those determined to be younger. Through this method, scientists have estimated an age for the river, and thus the canyon through which it flows, of 5-6 million years.
Explanation: