Human encroachment that has greatly reduced the prairie dog populations.
Answer:
maybe
Explanation:
LOL not to be mean but you can look it up on Google
Answer: By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
Explanation:
