UNIVERSE
Long long ago in the universe a small speck of gases consolidated and then appeared a Planet
The EARTH
LIFE
6 BILLION YEARS AGO
Life appeared in unicellular form
4 BILLION YEARS AGO
Life appeared in multicellular form
LIVING FORMS
INVERTEBRATES
VERTEBRATES
PISCES
AMPHIBIA
REPTILIA
AVES
MAMMALIA
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PRIMATES
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