Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Textbook Question
Chapter 32, Problem 2IQ
Describe the three hypotheses for the rapid diversification of animal phyla during the Cambrian period.
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Why is animal evolution during the early Cambrian referred to as an “explosion”?
The Cambrian explosion is a conundrum: how can the long prior history of the phyla, revealed by molecular divergence, be reconciled with their absence, and then sudden appearance, in the fossil record?
Which of the following is not a hypothesis
used to describe the sudden change in the
diversity of lifeforms observed in the
Cambrian Period?
a. Increased continental drift creating
greater terrestrial landmasses
O b. Predator-prey arms race due to
evolution of locomotion and
development of exoskeletons
O c. Evolution of the Hox genes which
regulate complex body plans
O d. Rising sea levels, increasing the
volume of area species could
occupy
e. Continental flooding driving
increased nutrient and mineral flux
in the oceans
Chapter 32 Solutions
Study Guide for Campbell Biology
Ch. 32 - a. What is a larva? b. How does a larva differ...Ch. 32 - Describe the three hypotheses for the rapid...Ch. 32 - Prob. 3IQCh. 32 - Prob. 4IQCh. 32 - Fill in the blanks in the following simplified...Ch. 32 - Prob. 1TYKCh. 32 - The process during which the germ layers are...Ch. 32 - Prob. 3TYKCh. 32 - Prob. 4TYKCh. 32 - Prob. 5TYK
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Describe a reason for the hypothesis that the ancestor of eleuthero-zoan groups was a radial, sessile organism.arrow_forwardWhich of the following is true about the phylogeny of birds and reptiles. Question 35 options: a) Birds are more closely related to amphibians then they are to reptiles. b) Birds are a type of reptile, but are not related to dinosaurs. c) Birds and reptiles are the least related vertebrates. d) Birds are a type of reptile and are descended from a group of dinosaurs.arrow_forwardWhich of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian periodarrow_forward
- The eon comprising the Cambrian period up to the present is called the (1). It is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Paleozoic era, first (2) appeared. Finally, the Cenozoic era is where (3), flourished, lasting up to this day.arrow_forwardplease see attachedarrow_forwardDiscuss three hypotheses, explaining the rise of Cambrian diversity and the decline of Ediacaran diversity, which are associated with predator-prey interactions, atmospheric conditions, and genetic changes.arrow_forward
- Explain what significant events happened during the Five major extinction events between the late Cambrian until the late cretaceous period.arrow_forwardUntil recent discoveries suggested otherwise, animals existing before the Cambrian period were believed to be: a. small and ocean-dwelling b. small and nonmotile c. small and soft-bodied d. small and radially symmetrical or asymmetricalarrow_forwardShade the geological time range for each fossilized organism, marking the time period where each fossil belongs to in a darker color (see example for fossil #2: Batostomella gracilis ): Fossil #7: Mucrospirifer thedfordensis Fossil #16: Cardioceras species Fossil #17: Dinosaur bone Fossil #21: Otodus species Fossil #23: Dentalium sexangulare Fossil #24: Physa humerosaarrow_forward
- Explain why mammal jawbones may have shifted to being a single solid bone from multiple bones. Explain why the huge increase in diversity is usually attributed to the Cambrian Explosion even though diversity may have actually increased prior to the Cambrian.arrow_forwardIn what way was the evolution of eukaryotic cells linked to the increase in the oxygen concentration in the atmosphere that occurred during the Precambrian?arrow_forwardcreate a cladogram summarizing the phylogenetic relationships among the different Phyla. Take note that some characters may be secondarily lost during the evolution of these different. there is a photo of example of cladogram belowarrow_forward
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