Darwin's opinion that living forms must be descended from extinct forms was based on ________ evidence.

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Darwin's opinion on the descent of living forms from extinct forms was based on fossil evidence, as he observed that the fossils of extinct forms were similar to living forms. This was one of the key pieces of evidence supporting his theory of evolution by natural selection. While anatomical, biochemical, and biogeographical evidence are also used to support evolution, it was specifically fossil evidence that Darwin focused on in this context.

Darwin's Opinion That Living Forms Must Be Descended from Extinct