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?
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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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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