Answer:
Earth's atmosphere is made up of a combination of gases. The major components of nitrogen, oxygen, and argon remain constant over time and space, while trace components like CO 2 and water vapor vary considerably over both space and time.
Explanation:
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Plants and animals can't live everywhere because they need resources that can be found in some biomes. For example a cactus can't live in the rain forest because they are not adapted to the climate and resources.
Answer:
Astronomers find it difficult because of the light coming off the stars so it makes them difficult to see.
Explanation:
