geologic history and evelution life

what are the longest units of time called?

how mant eons have there been so far

when many species die in a short period of time

the change of a species over time

a new type of multicellular organisms is know as (). They had ().

early palezoic organisms that lived in the ocean were called

invertabrites had no

animals WITH backbones were called

some of the earliest vertabrites were

majior collison between () occured in the Paleozoic era which caused ()

fishlike organisms eveolved into

amphibians must return to water to

reptiles were

warmer climate made

the dominant geologic event of the mesozoic era was

pangea broke up during

pangea broke up into two continents:

climate in the mesozoiuc ear was

crocodiles share a common ancestor with

North America drifting west and colliding with smaller islands=

dinosours and croocodiles differ in their

dinosours might relate to present day

flying reptiles

() eveolved during the mesozoic era but remained small