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Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.

Dna is a polymer of which consist of a sugar, a phosphate group, and a a. amino acids; nucleotide b. nucleic acids; nucleotide c. nucleotides; nitrogenous base d. nucleotides; nucleic acid e. proteins; nucleotide