I think its salinity because the other things have something to do with tracking precipitation
A food wed is about who eat who like for example I think the human are on the top of the food chain because no one eat him
The first three are the same as those found in DNA, but in RNA thymine is replaced by uracil as the base complementary to adenine. This base is also a pyrimidine and is very similar to thymine. Uracil is energetically less expensive to produce than thymine, which may account for its use in RNA.
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1) aluminum
2) copper
3) white paper
