Covers one-half of the earth is NOT a characteristic of a desert ecosystem.
We can only be certain that life exists on our own planet, Earth, somewhere in the universe.
Earth was created from a swirling cloud of gas and dust around 4.6 billion years ago, together with the rest of our solar system and our star, the sun.
The planets of the solar system are thought to have formed from diverse parts that condensed from this gas and dust to form a disk.
A desert is a desolate region of the landscape with minimal precipitation, making living circumstances unfriendly for both plant and animal life.
The lack of vegetation exposes the exposed ground surface to denudation processes.
Arid or semi-arid regions make up around one-third of the Earth's geographical surface. This comprises a large portion of the arctic regions, which are frequently referred to as polar deserts or "cold deserts" because they receive minimal precipitation.
The amount of precipitation that occurs, the temperature that prevails, the reasons for desertification, or the geographic location of a desert can all be used to categorize it.
Hence, option D is correct.
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