Ch_35_Higher_Verterbrates Flashcards
periods of the Mesozoic Era
Triassic, Jurassic, Cretaceous
When was the Triassic period?
250 - 200 mya
When was the Jurassic period?
200 - 145 mya
When was the Cretaceous period?
145 - 65 mya
Why are Reptilia the first animals to colonize land
shelled egg did not need to be in water
How do Reptiles prevent losing water
scaled skin that are dry
Since eggs are shelled, how are they fertilized?
internal
Ectotherm definition
cold blooded
Reptiles are warm blooded or cold blooded
cold blooded
Some Reptiles _ in cold climates
hibernate
Which class was the first flying vertebrates
Reptilia
Four membranes of Amniotic egg
Chorion, Amnion, yolk sac, Allantois
Chorion
outermost layer of Amniotic egg - gas exchange
Amnion
second-most outer layer of Amniotic egg - surrounds embryo in fluid-cavity
yolk sac
Amniotic egg layer that has food
Allantois
layer of Amniotic egg that has excreted wastes
Animals that are reptiles
snakes, turtles, tortoises, crocodiles, alligators, lizards, dinosaurs (debatable)
T/F Dinosaurs descended from the first reptiles on land
T
When did dinosaurs first appear?
Mesozoic Era
Major reason proposed for dinosaur extinction
meteorite
Why did some species of small reptiles survive the meteorite and cold winter?
hibernate in cold
Why did various bird and mammals survive the meteorite?
warm blooded and small
Lizards make up what percent of reptile species
50%
Number of Lizard species
3,800