The triangles show the inferred origins of "warm-blood" in billfishes and tunas. Knowing that the most recent common ancestor of all the fish in the tree was cold-blooded and that all the fishes in the tree except tunas and billfishes are cold-blooded, what can be said?
The triangles show the inferred origins of "warm-blood" in billfishes and tunas. Knowing that the most recent common ancestor of all the fish in the tree was cold-blooded and that all the fishes in the tree except tunas and billfishes are cold-blooded, what can be said?
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 11RQ: Frogs belong to which order? Anura Urodela Caudata Apoda
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Most fish species are considered cold-blooded because they can't generate body heat like birds and mammals. Billfishes and Tunas are notable exceptions. These fish can generate significant amount of body heat and are thus considered warm-blooded. The tree below shows the relationship among several species of fish including billfishes and tunas. The triangles show the inferred origins of "warm-blood" in billfishes and tunas. Knowing that the most recent common ancestor of all the fish in the tree was cold-blooded and that all the fishes in the tree except tunas and billfishes are cold-blooded, what can be said?
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