quiz four Flashcards
When did the lizard like beings first start coming on the scene
about 250 Ma
What characteristic do we share with the bony fish
they have lobed fins!
lobes are precursors to what…
walking limbs (means we are related to the amphibians)
what kind of lifestyle to our relatives start living at this point
a “semi-aquatic” lifestyle. Half on land and half in water. just like Icyhostega.
creatures that come after icyostega. reproduce through amniotic eggs
tetrapods
how did the tetrapods reproduce
they lay the amniotic eggs but these do not rely on water
turtles are…
anapsids
marine reptiles like the plesiosaur are…
Euryapsids
crocodilia & pterodactyl are..
diapsids
DINOSAUR DIVERSITY IS GREATEST IN….
THE CRETACAOUS
What are the two main dinosaur groups
Ornithischia & Saurischia
what kind of dinosaur are birds descended from
Theropods
What are dinosaur bones made out of
organic matter and calcium. they also remodel as they grow
what do the lines of attested growth mean..
Dinosaurs, like us, have childhood, adolescence, and adulthood
evidence dinosaurs are warm blooded
upright posture, fast growth rate, their size infers active circulation system, & predator prey ratios
fossilized feces
coprolites.
details of the end k/t extinction
so it was a nice day 65Ma, then a bolide that’s really big comes. Crosses through the atmosphere in one second, and the air became very hot
then it collided into the crust and caused lava to splash up
more details pt 2
then forest caught on fires, many different natural disasters, tsunamis that were absolutely massive
Americas became a wasteland, followed by dark winter
what occurred in Italy
so there was a ocean plankton extinction at the same time of the dinosaurs
a clay layer was found but not really anything below it
cosmic dusts and layers of iridium,