The evidence of bias that exists in the passage is that Columbus exaggerates his observations.What is bias?Bias refers to the tendency or preference for a particular perspective, ideology, or result, particularly in a way that hinders impartial judgment. Bias may manifest in the presentation of facts or the selection of data to support a pre-existing belief. It may also arise from personal or group biases. When the author provides misleading or overly dramatic descriptions of a person, place, or situation, they are said to be biased in their work.In the given passage, Christopher Columbus exaggerates his observation when he says that the trees never lose their leaves and always remain green, which is impossible as all trees shed their leaves at some point in time.