Scientists correctly understand evolutionary trees like these to be hypotheses.
A hypothesis is a put forth explanation for a phenomenon (plural: hypotheses). A hypothesis must be testable according to the scientific method for it to be considered a scientific hypothesis. Scientific hypotheses are typically based on prior observations that cannot be adequately explained by the current body of knowledge. Despite the frequent confusion between the terms "hypothesis" and "theory," a scientific hypothesis differs from a scientific theory. A working hypothesis is a theory that has been tentatively accepted and is put up for further investigation after starting with an informed guess or idea. In formal logic, the term "hypothesis" has a separate meaning that designates the antecedent of a proposition.
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