Question

Fossil X is said to be evolved earlier than fossil Y, if fossil

• A. Y has functional organs that were vestigial in X
• B. Y is more structurally complex than X
• C. Y is in better state of preservation than X
• D. X is found in the lower layers of rocks than Y

Answer 1

Answer: (B), (D)

The correct options are
B Y is more structurally complex than X
D X is found in the lower layers of rocks than Y

Fossils are preserved forms of living organisms that existed on the earth in remote past. Presence of X in the lower layers of undisturbed rock indicates that X evolved earlier than Y.
As the organism evolves, complexity increases which also depicts that X evolved earlier than Y.
Vestigial organs are the ones that were functional in the ancestors which has no role in the present generation not vice versa.