Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
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.
15. On the tree below, mark the place or places that three tissue layers have evolved in
animals.
Tissue
Lineage
Layers
Porifera
N/A
Cnidaria
2.
Platyhelminthes
3.
Rotifera
3.
Annelida
3.
Mollusca
Nematoda
3
Arthropoda
Echinodermata
3.
Chordata
Is the possession of three tissue layers homologous or convergent among animals?
Answer according to phylogenetic tree for animal phyla
1. Which phyla are radically symmetrical?
2. Which phyla are coelomates?
3. Which phyla are triploblastic? Explain what triplobastic means.
4. Which phyla have segmented bodies and a closed blood system?
5. a) Differentiate between an exoskeleton and endoskeleton.
b) Which phyla have these skeletons?
c) Give one advantage and disadvantage of each of this skeletons
6. Which phylum did not hive rise to any other group of animals?
7. Name one feature of the chordates that make them different from the other phyla
8. What was the common ancestor of all animals?
Chapter 33 Solutions
Campbell Biology (10th Edition)
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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- Test Your Understanding 1.Which of the following is not a shared derived character of echinoderms? (a) water vascular system (b) notochord (c) tube feet (d) pentaradial symmetry in adult (e) endoskeleton of calcium carbonate plates and spinesarrow_forwardOne important innovation in animals that can be seen very nearly in animals from the phylum Annelida is the evolution of segmentation. Explain reasons why segmentation may represent an evolutionary advantage for more complex animals???arrow_forwardEvol question: If the common ancestor of Cnidarians were an open-ocean jellyfish, what would you infer regarding the evolutionary trends in the relative importance of the polyp and medusa stages?arrow_forward
- Discuss Concepts Whentetrapods first ventured onto the land, what new selection pressures did they face? What characteristics might have fostered the success of these animals as they made the transition from aquatic to terrestrial habitats?arrow_forwardIs the presence of myomeres a symplesiomorphic or synapomorphic feature of vertebrates compared to conditions in other deuterostome metazoans? And are these structures symplesiomorphic, synapomorphic, or neither for vertebrates considered alone?arrow_forwardSee 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?arrow_forward
- Put the following milestones in animal evolution in orderfrom oldest to most recent: (a) origin of mammals,(b) earliest evidence of terrestrial arthropods, (c) Ediacaranfauna, (d) extinction of large, nonflying dinosaurs.arrow_forwardAmniotes are descended most closely from which of the following groups O reptiliomorphs O lepospondyls O batrachomorphs sauropodomorphs Vertebrates possess all the following synapomorphies except which? * O bone O ventral nerve cord O vertebrae O expansion of anterior nerve cord craniumarrow_forwardWhy are Cnidarians diploblast and other animals tripoblast based on evolution?arrow_forward
- What is the possible reason why some cnidarians had evolved to a stony skeleton? plz include citationsssarrow_forwardAccording to the picture blow, how many times did branched filaments evolve in dinosaurs?arrow_forwardAnimal Kingdom Do not possess a backbone Possess a backbone Asymmetric, Bilateral symmetry, does not Four limbs; possesses true tissues, three germ layer, most have a complete gut possess true possesses a notochord lungs tissues Mouth forms second, Radial symmetry, opposite end from the blastopore possesses true tissues, two germ layers, gastrovascular cavity, cnidocyte stinging cells Terrestrial adaptation to protect embryo possesses a spiny skin or calcareous endoskeleton, water vascular system Mouth forms first from the blastopore Place the letter in the Arthropoda i. j. h. Sheds a cuticle or possesses either a lophophore feeding apparatus or a trochophore larvae appropriate blank tetrapods Porifera exoskeleton via ecdysis a. Echinodermata b. Cnidarians k. Vertebrates Ecdysozoa I. Protostomia с. d. Deuterostomia m. Amniotic egg Bilateria Segmented, possess jointed feet, complex head (cephalization) Lophotrochozoa Chordata е. n. Segmented, bristles, f. Annelida o. g. invertebrates…arrow_forward
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