Why Have We Not Found Examples In The Fossil Record Of Every Animal That Ever Lived On Earth?

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Why Have We Not Found Examples In The Fossil Record Of Every Animal That Ever Lived On Earth?

-It is just a matter of time before we find them all. Rocks contain the history of all life, if you know where to look. -To become a fossil, an animal must remain buried for thousands or millions of years until it (and the layer around it) turns to rock. -Many fossils remain buried. We can only find them when they are exposed by erosion or excavation. -To become a fossil, an animal must be quickly and completely buried in ash or sediment before it has a chance to decompose.
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-To become a fossil, an animal must remain buried for thousands or millions of years until it (and the layer around it) turns to rock. -Many fossils remain buried. We can only find them when they are exposed by erosion or excavation. -To become a fossil, an animal must be quickly and completely buried in ash or sediment before it has a chance to decompose.
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