Campbell Biology, Volume 2 - With Access (Custom)
Campbell Biology, Volume 2 - With Access (Custom)
14th Edition
ISBN: 9781269750028
Author: Reece
Publisher: PEARSON
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Chapter 33.2, Problem 3CC

MAKE CONNECTIONS Ø Many new animal body plans emerged during and after the Cambrian explosion. In contrast, cnidarians today retain the same diploblastic, radial body plan found in cnidarians 560 million years ago. Are cnidarians therefore less successful or less "highly evolved" than other animal groups? Explain. (See Concepts 25.3 and 25.6.)

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MAKE CONNECTIONS Historically, annelids and arthropods were viewed as closely related because both havebody segmentation. Yet DNA sequence data indicatethat annelids belong to one clade (Lophotrochozoa) andarthropods to another (Ecdysozoa). Could traditionaland molecular hypotheses be tested by studyingthe Hox genes that control body segmentation (seeConcept 21.6)? Explain.
Q5. Lungs allow an animal to breathe _____________. Why did this adaptation evolve? Q6. Tetrapods use ____________ to breathe. Do any modern tetrapods have gills? Explain. Q7. How did the anatomy of the shoulder and head change during tetrapod evolution? Q8. Acanthostega and Icythyostega have been called fish-like tetrapods. Explain why they are described as such and describe the environment in which they probably lived. Q9. __________________ and _____________________ are early tetrapods that do not have features unique to fish. Describe how these two species differ anatomically and what that means about where they each lived.
See attached. 1. Which pair of animals in numbers 1-3 belongs to a common ancestral group? Explain your answer.2. Fossils and anatomical records both provide pieces of evidence of evolution. How do you determine the age of fossils of an Aurorazhdarcho micronyx and an Archeopterix?
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