Geologic time periods

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

Penguins

Why do we need to protect them?

What is the cause of the animal population decreasing in number?

What is being done to help them?

How successful is the help?

Pic- habit  food breeding

green peace