Study Card For Campbell Biology
11th Edition
ISBN: 9780134486482
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 32, Problem 32.2CR
What caused ihe Cambrian exploston? Describe current hypotheses.
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What is the “Cambrian explosion,” and why is it significant?
To what does the Cambrian “explosion” refer?
Why would a rise in the availability of oxygen help explain why the Cambrian explosion occurred?
Chapter 32 Solutions
Study Card For Campbell Biology
Ch. 32.1 - Summarize the main stages of animal development....Ch. 32.1 - WHAT IF? What animal characteristics would be...Ch. 32.2 - Put the following milestones in animal evolution...Ch. 32.2 - VISUAL SKILLS Explain what is represented by the...Ch. 32.2 - MAKE CONNECTIONS Evaluate whether the origin of...Ch. 32.3 - Distinguish the terms grade and clade.Ch. 32.3 - Compare three aspects of the early development of...Ch. 32.3 - Prob. 3CCCh. 32.4 - Prob. 1CCCh. 32.4 - WHAT IF? Suppose ctenophores are basal metazoans...
Ch. 32.4 - Prob. 3CCCh. 32 - Prob. 32.1CRCh. 32 - What caused ihe Cambrian exploston? Describe...Ch. 32 - Describe how body plans provide useful Information...Ch. 32 - Prob. 32.4CRCh. 32 - Prob. 1TYUCh. 32 - The distinction between sponges and other animal...Ch. 32 - Prob. 3TYUCh. 32 - Prob. 4TYUCh. 32 - EVOLUTION CONNECTION A professor begins a lecture...Ch. 32 - SCIENTIFIC INQUIRY INTERPRET THE DATA Redraw the...Ch. 32 - WRITE ABOUT A THEME: INTERACTIONS Animal life...Ch. 32 - SYNTHESIZE YOUR KNOWLEDGE This organism is an...
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- -How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms? -How much time is there between complex forms and the Cambrian Explosion?arrow_forwardMultiple Cholce Question The. approach creates phylogenies based on shared derived characters and ancestral characters. O taxonomic O genetic O paleontologic O cladisticarrow_forwardErnst Mayr defined a biological species as a population whosemembers can exchange genetic material during reproduction (seechapter 14). How does horizontal gene transfer complicate thisdefinition of species?arrow_forward
- What does the endosymbionttheory propose as the originfor mitochondria andchloroplasts? Explain.arrow_forwardThe 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?arrow_forwardHow did the researchers use the DNA of living sponges to make conclusions about events occurring hundreds of millions of years ago?arrow_forward
- Why is animal evolution during the early Cambrian referred to as an “explosion”?arrow_forwardWhich event in Earth’s historyeventually lead to the evolution of multicellular lifeforms?arrow_forwardhow organisms evolved through time. What are pressures that caused the evolution of these organisms ortheir extinction?arrow_forward
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