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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Transcribed Image Text:Paleontologists at Grand Staircase-Escalante National Monument discovered a new
ceratopsid skull. The skull has a moderate-sized neck frill, indicating a small body, and
has two short horns. The table shows rock formations at the monument and the location of
known fossils relative to those formations.
Ceratopsid Fossil
Locations
Cretaceuos-Age Rocks
MYA
Formation
Canaan Peak
70-
Triceratops
Torosaurus
Kaiparowits
80-
Centrosaurus
Chasmosaurus
Wahweap
Straight Cliffs
90-
Zuniceratops
Tropic Shale
Dakota
San Rafael Swell
100
Protoceratopsid
Based on the evolutionary relationship suggested by the anatomy of the skull, in which of
the following formations was the skull found?
Dakota
Wahweap
Kaiparowits
Canaan Peak

Transcribed Image Text:Researchers were working to determine the evolutionary history of modern horses using
fossils of four horse ancestor species in North America. They had incomplete data for
some of the fossils.
This is the data available to the researchers.
Species
Fossil
Percent
Age of Rock
Location
Uranium
Layer
235
Decay
Mesohippu
Colorado
3.2
Unknown
Merychippu
Montana
1.7
20-13 million
years ago
Dinohippus
Montana
Unknown
3-5 million
years ago
Orohippus
Wyoming
5.4
Unknown
Based on the data presented, what is the order of the fossils from most distant to most
recent ancestor?
Mesohippus, Dinohippus, Orohippus, Merychippus
Dinohippus, Merychippus, Mesohippus, Orohippus
Merychippus, Orohippus, Dinohippus, Mesohippus,
Orohippus, Mesohippus, Merychippus, Dinohippus
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