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Fossilization can occur when (1) Animal...

Fossilization can occur when (1) Animals are buried and preserved by natural processes (2) Animals are destroyed by the scavengers (3) Animals are eaten up by predators (4) Animals are destroyed by environmental conditions.

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`Zn^(2+)` has completely filled d-orbitals `(3d^(10))` while `Ni^(2+)` has incompletely filled d-orbitals`(3d^(8))`
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