- How do we know if any other planets have oxygen in the atmosphere?

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Which is the biggest country in this world? If f(x)=x^2-1 and h(x)=4x+3, then f(h(2))=? Are these finite or infinite ? A sample of P-33 has an activity of 0.200 Curies. How long will it take for the activity of the sample to drop to 0.0354 Curies? The square base has sides of length 8 inches and the slant height is 6 inches. what is the surface area of the block.?