Life Forms

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Life Forms

The many life forms of the Precambrian era were
not complex and they were also invertebrates.
Some of these might have been- stromatolites,
archea, eukaryotes, and the first multi-celled
animals and multi-celled algae. There were also
marine animals such as-jelly fish and marine
worms.
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Weather and Atmosphere

• At first oxygen was a major gas in Earths
  Atmosphere, and then the ozone layer in the
  stratosphere began to develop, which shielded
  Earth from ultra-violet rays. These changes
  allowed single-celled organisms to change into
  complex organisms.

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PERIODS

• Precambrian time was the longest time in the
  Geologic time scale. It has two eras and one
  period. The first one is Hadean time, then
  Archean era, and finally Proterozoic era.

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Plants

• The plants were fern like and weren't flowering.
• Some land organisms were mostly arthropods and
  organisms like trilobites.
• The super continent was also beginning to break
  apart.
• Some plants were liver warts, fern, and cycads.

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Weather

• Much of the Northern Hemisphere was under warm,
  shallow seas.
• The atmosphere was mostly nitrogen and oxygen.
• The weather was warm and dry.

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Animals

• Most of the animals were fish and amphibians.
• Most of the fossils that were found were
  underwater creatures.

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Weather

• The weather in the carboniferous Period was
  tropical and humid all year round even in winter.

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Plants

• Conifers are major type of plant of this period.
  The fish in this time were not well developed.

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Life-forms of Carboniferous

• Some of the life-forms include Shails,
  centipeds,scopions,and lots of kind of cockroach
  increase on land. In the sea there are sea
  scorpions, bryozoans, for aminifers, and
  brachiopods.

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Mesozoic time

• In this time period many new species were
  evolving, climate was changing, and the Earths
  continents were dividing.

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Pangaea Changes

• During this time period the continents started to
  drift. This separated Pangaea, forever.

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Animals and plants

• In this era there were many animals. It ranged
  from reptiles to mammals. Also there were many
  types of insects, like centipedes and beetles.
• The plants in this era were more like evergreens
  instead of leafy plants. They mostly consist of
  gymnosperms.

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About the Cenozoic Era

• During the 65 billion years of the Cenozoic era
  or age
• of mammals, the world took on its modern form.

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Animals

• Invertebrates, fish, reptiles, etc were
  essentially of modern types, but mammals, birds,
  protozoa and flowering plants still evolved and
  developed during this period.

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Climate

• At first warm and mild.
• Later a good to buy property, since their will be
  much more exposed land. So much water is frozen
  in ice around the world, that ocean levels drop.
  

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Continents

• The Cenozoic continents are still the same form
  the time of the Cenozoic Intel today.