Fossils of trees were discovered in a sedimentary rock layer, and in a rock layer below were fossils of clams. Based on this evidence, what conclusion can be made about the sequence of climates in the past in the area where the fossils were discovered?

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

what is the statement?