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Biology ch 2.6-2.7 & 3.2-3.5 > life formed > Flashcards

life formed Flashcards

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1
Q

Cenozoic

A

65 million yrs ago-present day

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2
Q

Mesozoic

A

230million-65million yrs ago

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3
Q

paleozoic

A

600million-230million yrs ago

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4
Q

Precambrian (prehistory of life)

A

4.6 billion-600million yrs ago

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5
Q
  1. Solar system formed (4.6 billion Precambrian)
A

-meteorite showers and volcanic activity
-earth cooled: solid litosphere (crust &mantle) , ocean + gaseous atmosphere formed, BUT NO OXYGEN-> no ozone layer to protect from UV radiation-> harsh environments

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6
Q
  1. Chemical evolution (precambrian)
A

-complex chemical compounds formed: amino acids( material for protein) -RNA & DNA formed from inorganic substances

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7
Q
  1. Biological evolution (precambrian)
A
  • protocell (primitive cell similar to bacteria) -engulfed other bacteria that became cell organelle
    ->UV radiation caused mutation
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8
Q
  1. First organisms
A

unicellular bacteria & archaea (prokryotes-no nucleus)
- heterotrophic

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Biology ch 2.6-2.7 & 3.2-3.5 (9 decks)

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