Campbell Biology, Volume 2 - With Access (Custom)
14th Edition
ISBN: 9781269750028
Author: Reece
Publisher: PEARSON
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Chapter 33, Problem 33.5CR
You've read that echinoderms and chordates are closely related and have evolved independently for over 500 million years. Explain how both of these statements can be correct.
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Based on the diagram, which statement is true about the evolution of animals?
A.
Echinoderms evolved after chordates.
B.
Mineralized skeletons deveoloped before notocords.
C.
Chrondricthyes share chordate ancestors with myxini.
D.
The ancestral deutrosome had a notocord and vertebrae
If members of a group, such as chordates , evolved from a common ancestor then they should show similarities in structure, which supports this hypothesis?
Describe how paedomorphosis as a mechanism could explain the evolution of the chordate body plan (from echinoderm larval form to a craniate form).
Chapter 33 Solutions
Campbell Biology, Volume 2 - With Access (Custom)
Ch. 33.1 - Prob. 1CCCh. 33.1 - Prob. 2CCCh. 33.2 - Compare and contrast the polyp and medusa forms of...Ch. 33.2 - Prob. 2CCCh. 33.2 - MAKE CONNECTIONS Many new animal body plans...Ch. 33.3 - Prob. 1CCCh. 33.3 - Prob. 2CCCh. 33.3 - MAKE CONNECTIONS Explain how the molluscan foot...Ch. 33.4 - Prob. 1CCCh. 33.4 - Describe two adaptations that have enabled insects...
Ch. 33.4 - MAKE CONNECTIONS Historically, annelids and...Ch. 33.5 - Prob. 1CCCh. 33.5 - WHAT IF? The insect Drosophila melanogaster and...Ch. 33.5 - MAKE CONNECTIONS Describe how the features and...Ch. 33 - Lacking tissues and organs, how do soonges...Ch. 33 - Describe the cnidarian body plan and its two major...Ch. 33 - is the lophotrochozoan clade united by unique...Ch. 33 - Describe some ecological roles of nematodes and...Ch. 33 - You've read that echinoderms and chordates are...Ch. 33 - A land snail, a clam and an octopus all share...Ch. 33 - Prob. 2TYUCh. 33 - The water vascular system of echinoderms (A)...Ch. 33 - Prob. 4TYUCh. 33 - In Figure 33.2, which two main clades branch from...Ch. 33 - Prob. 6TYUCh. 33 - Evolution connection Interpret thf data Draw a...Ch. 33 - Prob. 8TYUCh. 33 - Prob. 9TYUCh. 33 - SYNTHESIZE YOUR KNOWLEDGE Colleclively, do these...
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- Explain why echinoderms and chordates are nowconsidered to be closely related.arrow_forwardwrites a paragraph that describe the different types of evidence for the fact that tetropods evolved from fish.arrow_forwardBirds evolved from a group of bipedal dinosaurs known as theropods. True or false?arrow_forward
- Tetrapods evolved from_______ . a. sharks c. lobe-finned fishes b. teleosts d. placodermsarrow_forwardWhy are plesiadapiforms most likely the earliest primate ancestors? A. They do not have a postorbital bar or plate B. Their eyes are forward-facing C. They have grasping fingers D. They have clawsarrow_forwardList three groups of adaptations that guided vertebrate evolution, and explain how each has contributed to the success of vertebrates.arrow_forward
- Urochordates, instead of amphioxus, are now considered the sister group of vertebrates. Why is amphioxus, instead of urochordates, still considered a better model for the early vertebrate body plan?arrow_forwardFossils suggest that the first major trait distinguishing human primates from other primates was __________.arrow_forwardIn 1928 Walter Garstang hypothesized that tunicates resemble the ancestral stock of the vertebrates. Explain this hypothesis and evaluate its validity with recent phylogenetic, fossil, and developmental data.arrow_forward
- Match the benefit to the correct chordate adaptation. (match each number to the correct letter) 1. allows organisms to walk on land 2. allows organisms to lay eggs on land, without water 3. allows organisms to generate their own heat 4. provides a rigid structure for muscles A.bony skeleton B. Ectotherm C. Tetrapod D. Amniotic eggs E. Endotherm F. Seedsarrow_forwardWhich of the following could be considered the most recentcommon ancestor of living tetrapods?(A) a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrialvertebrates(B) an armored, jawed placoderm with two pairs of appendages(C) an early ray-finned fish that developed bony skeletalsupports in its paired fins(D) a salamander that had legs supported by a bony skeletonbut moved with the side-to-side bending typical of fishesarrow_forwardGiven that modern echinoderms and chordates look nothing alike, what factors have led zoologists to propose a close evolutionary relationship between these two phyla?arrow_forward
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