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What is Archaeology?
Important Questions on Timeline and Sources of History
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(i) Fossils are remains of hard parts of life forms in rocks.
(ii) Dinosaurs disappeared about 65 mya.
(iii) Animals called lobe fins evolved into reptiles.
(iv) Study of fossils is called palaentology.

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The given figure shows undisturbed sedimentary strata at the bottom of an ocean. The fossil found in layer Y resembles the fossil found in layer X. This similarity most likely suggests that

