Name them
Mesozoic
precambrian
ediacaran
orosirian
ectasian
paleoarchean
eifelien
Precambrian earliest
first organisms single called
later multifaceted organisms
Cambrian mya lots of different organisms
earliest animals with backbone
lots of carbon dioxide
Ordovician mya lots of animals without skeletons
early shellfish, trilobites nautilus starfish fish first green plants fungi end of ice
Silurian
First advanced plants and fish with armour
more shellfish
Fri trees seeds
winged insect
First amphibians
some animals from earlier periods die out
Early sharks and large trees
reptiles
trilobites
Pushed into one big group Gondwanaland
Beetles
and flies appear
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