What is the earth?
What is the atomosphere

Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity.

Explanation:

It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor. This mixture of gases is commonly known as air.

Earth is the third planet from the Sun and the only astronomical object known to harbor life. About 29.2% of Earth's surface is land consisting of continents and islands.Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor. This mixture of gases is commonly known as air.

Explanation:I cited this as my claim because it shows and explains the question that is giving.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".