All birds living today are descended from a group of dinosaurs called theropods. Theropods first appeared in the fossil record around 200 million years ago. However, fos- sils of taxa similar to modern birds can be found in the fossil record from around 66 million years ago. The table below provides information about certain traits in theropods and modern birds. An X indicates the presence of a trait. Theropods A Trait B с Bipedal D Hollow Bones Feathers Long Boney Tail Jaws with Sharp Teeth Fused Clavicle X Reversed First Toe A table that shows the comparison of traits in theropods and modern birds. X X X Modern Birds X X Each of the answer choices below describes a specific fossil. Which fossil provides the strongest evidence for the discovery of a transitional species that existed in the period between theropods and modern birds? X X X The fossil of a bipedal organism with hollow bones was found in a 100-million-year-old rock layer. The fossil of an organism with a reversed first toe and a long, bony tail was found in a 145-million-year-old rock layer. The fossil of an organism with jaws, sharp teeth, and a long, bony tail was found in a 170-million-year-old rock layer. The fossil of an organism with feathers and a reversed front toe was found in a 55-mil- lion-year-old rock layer.
All birds living today are descended from a group of dinosaurs called theropods. Theropods first appeared in the fossil record around 200 million years ago. However, fos- sils of taxa similar to modern birds can be found in the fossil record from around 66 million years ago. The table below provides information about certain traits in theropods and modern birds. An X indicates the presence of a trait. Theropods A Trait B с Bipedal D Hollow Bones Feathers Long Boney Tail Jaws with Sharp Teeth Fused Clavicle X Reversed First Toe A table that shows the comparison of traits in theropods and modern birds. X X X Modern Birds X X Each of the answer choices below describes a specific fossil. Which fossil provides the strongest evidence for the discovery of a transitional species that existed in the period between theropods and modern birds? X X X The fossil of a bipedal organism with hollow bones was found in a 100-million-year-old rock layer. The fossil of an organism with a reversed first toe and a long, bony tail was found in a 145-million-year-old rock layer. The fossil of an organism with jaws, sharp teeth, and a long, bony tail was found in a 170-million-year-old rock layer. The fossil of an organism with feathers and a reversed front toe was found in a 55-mil- lion-year-old rock layer.
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:All birds living today are descended from a group of dinosaurs called theropods.
Theropods first appeared in the fossil record around 200 million years ago. However, fos-
sils of taxa similar to modern birds can be found in the fossil record from around 66 million
years ago. The table below provides information about certain traits in theropods and
modern birds. An X indicates the presence of a trait.
Theropods
A
Trait
B
с
Bipedal
D
Hollow Bones
Feathers
Long Boney Tail
Jaws with Sharp Teeth
Fused Clavicle
X
Reversed First Toe
A table that shows the comparison of traits in theropods and modern birds.
X
X
X
Modern Birds
X
X
Each of the answer choices below describes a specific fossil. Which fossil provides the strongest evidence for
the discovery of a transitional species that existed in the period between theropods and modern birds?
X
X
X
The fossil of a bipedal organism with hollow bones was found in a 100-million-year-old
rock layer.
The fossil of an organism with a reversed first toe and a long, bony tail was found in a
145-million-year-old rock layer.
The fossil of an organism with jaws, sharp teeth, and a long, bony tail was found in a
170-million-year-old rock layer.
The fossil of an organism with feathers and a reversed front toe was found in a 55-mil-
lion-year-old rock layer.
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