Fossil 'X' can be considered to have evolved earlier than fossil 'Y' if fossil:

'Y' has vestigial structures that are homologous to functional structures in fossil 'X'.

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'Y' is structurally more complex than fossil 'X'.

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'Y' is in a better state of preservation than fossil 'X'.

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'X' is found in a lower stratum of undisturbed sedimentary rocks than fossil 'Y'.

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Solution

The correct option is D 'X' is found in a lower stratum of undisturbed sedimentary rocks than fossil 'Y'.
Fossil 'X' can be considered to have evolved earlier than fossil 'Y' if fossil 'X' is found in a lower stratum of undisturbed sedimentary rocks than fossil 'Y'. Fossils are preserved forms of living organisms that existed on earth a certain period of time ago. Presence of fossil 'X' in lower stratum indicates that it existed much before than fossil 'Y'.

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