What do we call the idea that we can never know the first or last occurrence of an animal from the fossil record?
Question
What do we call the idea that we can never know the first or last occurrence of an animal from the fossil record?
Solution
The idea that we can never know the first or last occurrence of an animal from the fossil record is known as the Signor-Lipps effect. This principle states that, since the fossil record is not complete, we are unlikely to find the first or last individual of a particular species. The fossil record is biased towards species that existed for a long time, were widespread, and were abundant. Therefore, the first and last individuals of a species are likely to be missing from the fossil record.
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