Imagine trying to assemble a jigsaw puzzle one piece at a time without knowing what the final picture will be. To accomplish this task, you would work with the individual pieces to build the image using

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

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