A solar system is a group of planets that orbit around a sun (giant burning star) that has enough gravity to keep the planets from crashing into each other, as well as stop them from drifting away
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Westward expansion meant that the US acquired ever increasing amounts of land, and needed people, farmers, to settle there so it could maintained without a huge military presence
The most abundant gas present in the air by volume would be A. Nitrogen, it composes about 80% of the air.
Answer:
An ecosystem consists of a community of organisms together with their physical environment while an environment is the surrounding where we live.