Biology - Study Guide
8th Edition
ISBN: 9780321501561
Author: Martha R. Taylor
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 25, Problem 4IQ
Summary Introduction
To explain: The changes in lifestyle that may be associated with the diverse forms that evolved in the 10 million years referred to as the Cambrian explosion.
Introduction: The Cambrian radiation is also called a Cambrian explosion. It is an event that occurred about 541 million years ago in the period of Cambrian. In this period, the major animal phyla appeared in the record of fossil.
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Why is animal evolution during the early Cambrian referred to as an “explosion”?
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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?
Chapter 25 Solutions
Biology - Study Guide
Ch. 25 - Why do we say that, for life to have begun, the...Ch. 25 - Prob. 2IQCh. 25 - Prob. 3IQCh. 25 - Prob. 4IQCh. 25 - Prob. 5IQCh. 25 - a. Mammals originated 180 mya but did not change...Ch. 25 - Prob. 7IQCh. 25 - a. According to the model of species selection,...Ch. 25 - Prob. 1SYKCh. 25 - Label the eons, eras, and key events shown on the...
Ch. 25 - Describe three major processes that have...Ch. 25 - Prob. 4SYKCh. 25 - The primitive atmosphere of Earth may have favored...Ch. 25 - Prob. 2TYKCh. 25 - Prob. 3TYKCh. 25 - The half-life of carbon-14 is 5,730 years. A...Ch. 25 - Prob. 5TYKCh. 25 - Prob. 6TYKCh. 25 - Prob. 7TYKCh. 25 - Look back at the Geologic Record in Table 25.1....Ch. 25 - Prob. 9TYKCh. 25 - According to the endosymbiont theory, a. the first...Ch. 25 - Prob. 11TYKCh. 25 - Prob. 12TYKCh. 25 - Prob. 13TYKCh. 25 - Prob. 14TYKCh. 25 - Prob. 15TYKCh. 25 - Prob. 16TYKCh. 25 - Prob. 17TYKCh. 25 - What is meant by the concept of species selection?...
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- Describe the evolutionary significance of the Cambrian explosion.arrow_forward-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_forwardwhat geology was occuring aroung the cambrian explosion that may have contributed to this diversification of life?arrow_forward
- What was the “Cambrian explosion” and how might you explain it?arrow_forwardTo what does the Cambrian “explosion” refer?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
- ''Cambrian Explosion'' What contributed to this explosion of life? What were Earth conditions like and in what ways were the multicellular animals becoming different to those of the Ediacaran Period? Additionally, which form(s) of life were likely to be human ancestors during the Cambrian?arrow_forwardFor about how many years of geological time have the dinosours existed on earth?? Did dinosours exist at the same time as humans? How do scientists determine when an era begins and when it ends? What is the purpose of making a geological timelinearrow_forwardDuring what era did pangs begin to break up? A. Cretaceous B. Triassicarrow_forward
- What kind of fossils were formed out of dinosaur remains and activities? Why do you say so? (Give three)arrow_forwardhow did the K-Pg (aka Cretaceous–Paleogene) mass extinction gave new ecological opportunities to mammals leading to adaptive radiation?arrow_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
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