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Explain the given diagram....

Explain the given diagram.

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i. The given diagram represents the structure of ground level and fossils i.e. the remants and impressions of organisms that remain preserved underground.
ii. Fossils of invertebrates, pisces, amphibians and some reptiles are found in the lowermost levels of ground indicating that they evolved around the paleozoic era.
iii. Fossils of reptiles were also found in the middle layers of the ground indicating that these fossils data back to the mesozoic era.
iv. The top most layer on the ground has fossils of aves and mammals indicating that they evolved in the cenozoic era.
v. The presence of fossils of animals in different layers of soil indicate that progressive development took place in animals.
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