For reproduction of life without the need for a water source
Advantages of Amniotic Egg:
hard outer shell for protection
food from yolk
water and nutrients from albumin
mini adult hatches - less vulnerable than larva
When did the first reptiles live?
315 million years ago, during the late Carboniferous
About the first reptiles
about 20cm long
they were insectivores
females most likely deposited eggs on land in moist, sheltered areas
fossil bones found in petrified stumps
What did mammals evolve from
Reptile group called Therapsids
When did mammals first appear?
210 millions year, late Triassic
Early mammals are believed to have been small, shrew creatures that lived in burrows, however recently larger mammals the size of dogs are believed to have been found alongside the dinos
Mammals had amniotic eggs - most likely inside the mother like most mammals today
Distinct mammals features
Distinct jaw structures and they have toothless young
