The fungal pathogen Batrachochytrium dendrobatidis, or Bd, has been strongly implicated in the decline of amphibians around the world.Researchers are currently debating whether Bd is a novel pathogen, recently introduced into wild populations (the "novel pathogen hypothesis"), or whether it existed before the declines and emerged because of human-caused environmental changes (the "emerging endemic hypothesis").Based on what you know about this disease and its spread, which hypothesis seems more likely? Justify your choice.
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