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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.

Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter24: Systematics And Phylogenetics: Revealing The Tree Of Life
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Problem 1ITD: The phylogenetic tree for 12 cat species (Felidae) reproduced at right was assembled from molecular...
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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.
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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