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1. The Devonian period is considered the Age of Fishes. Would you expect
to find a tetrapod (animal with four legs) fossil closer to the
Carboniferous period or the Silurian period? Why?

Respuesta :

Answer:

You would find one closer to the Carboniferous period.

Explanation:

You would find them closer to there because all life started out in the ocean and it took several eras for the land creatures to develop legs and the first era to have them is the Permian era and towards the end of the Carboniferous period. While the Silurina era was much earlier then both and still heavily influenced by crustaceons and other such sea creatures.

marianaegarciaperedo

Since the first tetrapods appeared at the end of the Devonian period, it is expected to find tetrapods fossils closer to the Carboniferous than to the Silurian period.  

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The paleozoic era goes  from 570 to 250 ma ago.

The era is composed of the following periods

  • CAMBRIC (570-490 ma)
  • ORDOVICIC (490-443 ma)
  • SILURIAN (440-400 ma)
  • DEVONIAN (400-360 ma)
  • CARBONIFEROUS (360-290 ma)
  • PERMIC (290-250 ma)

SILURIC (440-400 ma)

  • Gondwana was already formed. Laurasia was in its formation process

  • This is a recovery stage after the big massive Ordovician extinction.

  • Trilobites diversification and occurs bivalves' radiation.

  • The first gnathostomes appear.

  • First records of terrestrial vascular plants ⇒ small and with no supporting structures, inhabiting the water margins.

DEVONIAN (400-360 ma)

  • There are new adaptative strategies that separate even more the marine environment from the terrestrial one.

  • Age of Fishes

  • Definitive colonization and diversification of species in the terrestrial environment.

  • During this period, among other events, emerged the lineage that would later originate tetrapods, by the end of the period.

  • The first Ichthyostega emerges, which could be the ancestor of amphibians.

  • Expansion and diversification of plants

  • Firsts terrestrial arthropods emerged. Coevolution with plants started.

  • A big massive extinction occurred at the end of the period that severely affected the marine environment. Occurs a gradual replacement of terrestrial plants.

CARBONIFER (360-290 ma)

  • Begins Pangea formation

  • There is an ecological rechange in the ocean after the extinction

  • Amphibians emerge on the ground.

  • The first reptiles appear as anapsids, synapsids, diapsids.

  • Complete independence from water.

  • There was a diversification of horsetails and tree ferns, pro-gymnosperms, and gymnosperms.

  • Insects proliferation.

According to this information, by the end of Devonian period the firsts tetrapods appeared.

During the Carbonifeous period, after the devonian massive extinction amphibians and reptiles appeared.

These sequences indicate that tetrapod fossils are closer to the  Carboniferous period than the Silurian period.

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Learn more about Devonian period at

https://brainly.com/question/8930188?referrer=searchResults

https://brainly.com/question/19837678?referrer=searchResults

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