6. Organisms classified as “birds” share a common feature. What shared derived character defined this taxonomic group?7. What feature is present in all animals but is not present in birds and reptiles?8. Reptiles, birds, and mammals are amniotes. I’m addition to an amniotic egg, the common ancestor of all reptiles, birds, and mammals had a thick epidermal layer of scales partially composed of a protein called keratin. Keratinized skin helps prevent water loss in terrestrial environment. A. what type (or form) of Keratinized epidermal structure represents the ancestral character state of all reptiles, birds, and mammals? MammalsReptilesBirdsMarsupialsPrimatesRodentsFeathersPlacentaHairThe character statetransition fromscales to hair isindicated here.Keratin scalesAmniotic eggHair is a shared derivedcharacter that definesthe taxon containing allmammals.6. Organismns classified as "birds" share a common feature. What shared derived characterdefines this taxonomic group?7. What feature is present in all mammals but is not present in birds and reptiles?8. Reptiles, birds, and mammals are amniotes. In addition to an amniotic egg, the com-mon ancestor of all reptiles, birds, and mammals had a thick epidermal layer of scalespartially composed of a protein called keratin. Keratinized skin helps prevent waterloss in a terrestrial environment.What type (or form) of keratinized epidermal structure represents the ancestralcharacter state for all reptiles, birds, and mammals?a.

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Answered: 6. Organismns classified as "birds"…

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter29: Vertebrates

Section: Chapter Questions

Problem 16RQ: Which of the following feather types helps to reduce drag produced by wind resistance during flight?...

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6. Organisms classified as “birds” share a common feature. What shared derived character defined this taxonomic group? 7. What feature is present in all animals but is not present in birds and reptiles? 8. Reptiles, birds, and mammals are amniotes. I’m addition to an amniotic egg, the common ancestor of all reptiles, birds, and mammals had a thick epidermal layer of scales partially composed of a protein called keratin. Keratinized skin helps prevent water loss in terrestrial environment. A. what type (or form) of Keratinized epidermal structure represents the ancestral character state of all reptiles, birds, and mammals?

Mammals
Reptiles
Birds
Marsupials
Primates
Rodents
Feathers
Placenta
Hair
The character state
transition from
scales to hair is
indicated here.
Keratin scales
Amniotic egg
Hair is a shared derived
character that defines
the taxon containing all
mammals.
6. Organismns classified as "birds" share a common feature. What shared derived character
defines this taxonomic group?
7. What feature is present in all mammals but is not present in birds and reptiles?
8. Reptiles, birds, and mammals are amniotes. In addition to an amniotic egg, the com-
mon ancestor of all reptiles, birds, and mammals had a thick epidermal layer of scales
partially composed of a protein called keratin. Keratinized skin helps prevent water
loss in a terrestrial environment.
What type (or form) of keratinized epidermal structure represents the ancestral
character state for all reptiles, birds, and mammals?
a.

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