Parasitism bc the warbler's young are being displaced which means that the warblers are suffering harm through the loss of their young.
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Chromosome are part of DNA cells and threads like structure which contains the human genetic coded information for the humans . humans have total 46 chromosomes .
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Researchers also found that the longer a male's tail feathers, the faster he was able to shake them. This effort would require more muscular strength, and might be a powerful signal of fitness to the females.
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