Imagine if ornithology was like physics where we had some sort of "dark birds" that represent 95% of all birds but we just had no way to detect them besides the effect they have on other birds.
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Hypothetically this is possible but hard to do because biologists don't have conversation laws.
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This is the natural history of most of the modern phylae, very little fossilizes, and almost everything that does is only preserved if it is underwater. There are entire epochs where we infer pretty much everything we know about terrestrial life from the existence of black shale
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We just assume there was life in land during the Silurian for example but our evidence is somewhere between “there must have been” and “Devonian life is too developed” and “there is too much black marine shale” and “we assume there was terrestrial life in the Ordovician too”
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