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Give scientific reasons:

Vertebrates have been slowly originated from invertebrates.

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  • When the carbon dating method was used to assess the age of fossils, it was understood that invertebrates were present on the earth much before the vertebrates.
  • The fossils of invertebrates are present in lower layers of earth’s strata.
  • They were seen in Palaeozoic era of geological time period. Vertebrates dominated during Coenozoic era.
  • Their fossils are seen in the upper strata of the earth’s crust.
  • The structural complexity also increased in vertebrates. All these facts indicate that Vertebrates have slowly originated from invertebrates.

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