A number of scientists believe that the Permian extinction was caused by huge volcanic lava flows (from the Siberian traps) that may have caused low oxygen concentrations compared to the high oxygen levels in the Permian. Does this low oxygen level after the Permian extinction make it likely that dinosaurs, especially large ones, did not evolve immediately after the Permian extinction (252 million years ago)? Why or why not? FIGURE 17.24 Phylogenetic relation-ships and temporal duration (thick bars)of major groups of amniote vertebrates.Some authors define "reptiles" as oneof the two major lineages of amniotes,the other being the synapsids, whichincludes mammals. (After [53].)MammalsTherapsidsPelycosaursMesosaursProcolophonidsPareiasaursCaptorhinidsTurtlesProtorothyrididsCrocodiliansPterosaursDinosaurs (including birds)IchthyosaursRhynchocephalians (tuatara)Squamates (lizards and snakes)CPTrKPgNg3592992522011456623 PresentPaleozoicMesozoicCenozoicTime (Mya)JOrnithodiransLepidosaursArchosaursLepidosauromorphsArchosauromorphsParareptilesDiapsidsReptilesSynapsidsAmniotes

Answered: A number of scientists believe that the…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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A number of scientists believe that the Permian extinction was caused by huge volcanic lava flows (from the Siberian traps) that may have caused low oxygen concentrations compared to the high oxygen levels in the Permian. Does this low oxygen level after the Permian extinction make it likely that dinosaurs, especially large ones, did not evolve immediately after the Permian extinction (252 million years ago)? Why or why not?

FIGURE 17.24 Phylogenetic relation-
ships and temporal duration (thick bars)
of major groups of amniote vertebrates.
Some authors define "reptiles" as one
of the two major lineages of amniotes,
the other being the synapsids, which
includes mammals. (After [53].)
Mammals
Therapsids
Pelycosaurs
Mesosaurs
Procolophonids
Pareiasaurs
Captorhinids
Turtles
Protorothyridids
Crocodilians
Pterosaurs
Dinosaurs (including birds)
Ichthyosaurs
Rhynchocephalians (tuatara)
Squamates (lizards and snakes)
C
P
Tr
K
Pg
Ng
359
299
252
201
145
66
23 Present
Paleozoic
Mesozoic
Cenozoic
Time (Mya)
JOrnithodirans
Lepidosaurs
Archosaurs
Lepidosauromorphs
Archosauromorphs
Parareptiles
Diapsids
Reptiles
Synapsids
Amniotes

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