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Chapter 29 Comparing Invertebrates
Section 29–1 Invertebrate Evolution
(pages 745–750)
TEKS SUPPORT: 5C Levels of organization in multicellular organisms; 7A Anatomical similarities as
evidence of change in species
This section explains the origins of invertebrates. It also describes the major
trends in invertebrate evolution.
Introduction
(page 745)
1. What are three places where fossils have been found that shed light on the origins of
invertebrates?
a. Ediacara Hills, Australia
b. Chengjiang, China
c. Burgess Shale deposits in the Canadian Rockies
Origin of the Invertebrates
2. What are trace fossils?
(pages 745–747)
They are tracks and burrows made by soft-bodied animals whose
bodies were not fossilized.
3. Circle the letter of how old the fossils of the Ediacaran fauna are.
a. 700–600 years old
b. 6,500–7,500 years old
c. 60–75 million years old
d. 610–570 million years old
4. Is the following sentence true or false? Most fossils of Ediacaran fauna show little evidence
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of cell specialization.
false
5. What is the best known site of Cambrian fossils? The Burgess Shale of western Canada
is best known.
6. Circle the letter of each sentence that is true about animals of the Burgess Shale.
a. They were ancestors of most modern animal phyla.
b. They had features that are characteristic of most invertebrates living today.
c. They had specialized cells, tissues, and organs.
d. They were far less diverse than animals that lived earlier.
7. What features of the Burgess Shale animals made them so successful? The anatomies of
Burgess Shale animals typically had body symmetry, segmentation, some type of skeleton, a front
and a back end, and appendages adapted for many functions.
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Invertebrate Phylogeny
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(page 747)
8. To which group of invertebrates are chordates most closely related to?
Echinoderms
9. Number the features below according to the sequence in which they evolved. Number
the feature that evolved first 1.
4
a. Deuterostome development
1
b. Tissues
3
c. Coelom
2
d. Protostome development
Evolutionary Trends
(pages 748–750)
10. What does the appearance of each phylum in the fossil record represent in terms
of evolution? Each represents the evolution of a successful and unique body plan.
11. As larger and more complex animals evolved, in what ways did specialized cells
join together? Specialized cells joined together to form tissues, organs, and organ systems
that work together to carry out complex functions.
12. Circle the letter of each animal group that has organ systems.
a. flatworms
b. cnidarians
c. mollusks
d. arthropods
13. What is cephalization? It is the concentration of sense organs and nerve cells in the front of
the body.
cephalization? They exhibit bilateral symmetry and rely on movement for feeding, defense,
and other functions.
15. What are the three germ layers that most invertebrates develop from?
a. endoderm
b. mesoderm
c. ectoderm
16. What is a coelom? It is a body cavity.
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14. What body plan and lifestyle characterizes invertebrates that have evolved
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17. Label each of the cross sections according to whether it represents an acoelomate, a
pseudocoelomate, or a coelomate.
Digestive
tract
Digestive
cavity
Digestive
tract
Endoderm
Body
cavity
Ectoderm
Endoderm
Body
cavity
Ectoderm
Mesoderm
Mesoderm
Pseudocoelomate
Coelomate
Endoderm
Mesoderm
Ectoderm
Acoelomate
18. What does segmentation allow an animal to do with a minimum of new genetic material?
It allows an animal to increase in body size.
19. Most complex animal phyla have a true coelom that is lined completely with
mesoderm
.
20. In most invertebrates, the zygote divides repeatedly to form a(an)
blastula
.
21. What is the difference in early development between a protostome and a
deuterostome? In protostomes, the blastopore develops into a mouth. In deuterostomes,
the blastopore develops into an anus.
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22. Which groups of invertebrates are protostomes? Flatworms, roundworms, annelids,
mollusks, and arthropods are protostomes.
Reading Skill Practice
A good way to show similarities and differences between items is with a Venn
diagram, which consists of two or more circles that overlap. Create Venn diagrams
that compare these groups of invertebrates: (1) cnidarians and roundworms, (2)
annelids and mollusks, and (3) arthropods and echinoderms. Use the table in Figure
29–5 for the information to be contained in your diagrams. For more information
about Venn diagrams, see Organizing Information in Appendix A of your textbook.
Students should make three Venn diagrams, each reflecting differences and similarities in germ layers,
body symmetry, cephalization, coelom presence, and early development.
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Section 29–2 Form and Function in Invertebrates
(pages 751–758)
TEKS FOCUS: 6E Mitosis, meiosis, and sexual and asexual reproduction; 10A Body systems
This section describes how different invertebrate phyla carry out their
essential functions.
Introduction
(page 751)
1. What are seven essential tasks all animals perform to survive? The seven are feeding
and digestion, respiration, circulation, excretion, response, movement, and reproduction.
2. Why aren’t more complicated systems in living animals necessarily better than simpler
systems in other living animals? The fact that any system is found in living animals testifies
to its success in performing functions.
Feeding and Digestion
(pages 751–752)
3. How is the digestion of food different in simple animals compared to that in more
complex animals? Simple animals break down food primarily through intracellular digestion,
but more complex animals use extracellular digestion.
TYPES OF DIGESTION
Type
Definition
Intracellular digestion
Digestion of food inside cells
Extracellular digestion
Digestion of food outside the cells in a digestive tract
5. More-complex animals digest food in a tube called a(an)
Respiration
digestive tract
.
(pages 752–753)
6. Why do respiratory organs have large surface areas? The more surface area that is
exposed to the environment, the greater the amount of gas exchange that can occur.
7. Why are respiratory surfaces kept moist? Gases diffuse most efficiently across a moist
membrane.
8. What are gills? They are feathery structures that expose a large surface area to the
environment.
9. What are book lungs made of? They are made of parallel, sheetlike layers of thin tissues that
contain blood vessels.
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4. Complete the table about types of digestion.
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Circulation
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Date ______________
(page 754)
10. How do the smallest and thinnest animals meet the requirement of supplying oxygen
and nutrients to cells and removing metabolic wastes? They meet the requirement by
simple diffusion between their body surface and the environment.
11. Complex animals move fluid through their bodies using one or more
hearts
.
12. Label each of the organisms below according to which has a closed circulatory system
and which has an open circulatory system.
Hearts
Hearts
Blood vessels
Blood vessels
Open circulatory system
Closed circulatory system
13. Closed circulatory systems are characteristic of what kinds of animals? They are
characteristic of larger, more active animals.
Excretion
(pages 754–755)
14. What does the excretory system of most animals do? It rids the body of metabolic wastes
© Pearson Education, Inc. All rights reserved.
and controls the amount of water in their tissues.
15. How do aquatic invertebrates rid their bodies of ammonia? Ammonia diffuses from their
body tissues into the surrounding water.
16. Circle the letter of each way that terrestrial invertebrates eliminate nitrogenous wastes
from their bodies.
a. Ammonia diffuses from body tissues into the surrounding water.
b. They convert ammonia into urea.
c. They convert ammonia into uric acid.
d. They form a thick paste that leaves the body through the rectum.
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(page 756)
17. What three trends do invertebrates show in the evolution of the nervous system?
a. Centralization
b. Cephalization
c. Specialization
18. Number the following groups of invertebrates according to how centralized their
nervous system is. Number the group with the simplest nervous system 1.
2
a. Flatworms
1
b. Cnidarians
3
c. Arthropods
19. Is the following sentence true or false? The more complex an animal’s nervous system,
the more developed its sense organs are.
Movement and Support
true
(pages 756–757)
20. What are the three main kinds of skeletal systems among invertebrates?
a. Hydrostatic skeletons
b. Exoskeletons
c. Endoskeletons
21. What invertebrates have endoskeletons? Echinoderms
Sexual and Asexual Reproduction
(pages 757–758)
22. What is the difference between external and internal fertilization? In external
fertilization, eggs are fertilized outside the female’s body. In internal fertilization, eggs are fertilized
inside the female’s body.
23. Circle the letter of each sentence that is true about invertebrate reproduction.
a. Most invertebrates reproduce sexually in one part of their life cycle.
c. Asexual reproduction includes budding and division in two.
d. Most invertebrates have separate sexes.
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b. Asexual reproduction maintains genetic diversity in a population.
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WordWise
Match each definition in the left column with the correct term in the right
column. Then, write the number of each term in the box below on the line
under the appropriate letter. When you have filled in all the boxes, add up the
numbers in each column, row, and diagonal. All the sums should be the same.
Definition
Term
A. Fertilization in which eggs are fertilized inside the female’s
body
1. coelom
B. A body cavity completely lined with tissues from mesoderm
3. external fertilization
C. A body plan with mirror-image left and right sides
4. endoskeleton
D. The concentration of sense organs and nerve cells in
the front of the body
5. hydrostatic skeleton
E. Skeletal system in which muscles surround and are
supported by a water-filled body cavity
7. cephalization
2. exoskeleton
6. internal fertilization
8. bilateral symmetry
F. Fertilization in which eggs are fertilized outside the
female’s body
9. radial symmetry
G. A hard body covering made of chitin
H. A body plan with body parts extending from the center of the body
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I. A structural support located inside the body
A
B
C
6
1
8
D
E
F
7
5
3
G
H
I
2
9
4
=
=
=
15
15
15
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=
15
=
15
=
15
=
15
=
15
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