Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 24, Problem 3Q
Summary Introduction
To review:
The factors that resulted in the extinction of Ediacaran biota and the rise of the Cambrian type biota.
Introduction:
Ediacaran fossils are the strata formed by organisms found in the Ediacaran period. This period lasted from about 635 million years to 542 million years ago. Ediacaran strata are unique collection of soft-bodied organisms, mostly sessile organisms that are conserved worldwide as fossil impressions in this Ediacaran period.
The Cambrian period is the period of ancient life that lasted about 53 million years ago and it is known for dramatic evolutionary changes in life on the earth. Cambrian period faced Cambrian explosion that saw the diversity of life typically major animal groups alive today. The animal group majorly contains chordates, vertebrates such as humans.
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The Cambrian Explosion occurred due to the widespread adoption of bilateral symmetry and the extinction of the Ediacaran fauna. What is this burst of diversity referred to? Explain what kind of triggers these two factors are and why they led to greater diversity.
Explain what significant events happened during the Five major extinction events between the late Cambrian until the late cretaceous period.
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.
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- Which of the following shows the correct sequence of periods in the Mesozoic era: a) Triassic, Jurassic, Cretaceous b) Cretaceous, Jurassic, Triassic c) Jurassic, Cretaceous, Triassic d) Triassic, Cretaceous, Jurassicarrow_forwardWhat is the “Cambrian explosion,” and why is it significant?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
- In 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_forwardDescribe the evolutionary significance of the Cambrian explosion.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
- How did the researchers use the DNA of living sponges to make conclusions about events occurring hundreds of millions of years ago?arrow_forwardThe coal that we use as crude oil to run cars and other machines is the product of incomplete decomposition of organisms from the Jurassic. Carboniferous. Permian. Triassic.arrow_forwardBriefly describe the distinguishing organisms and major biological events of the Ediacaran period and the Paleozoic, Mesozoic, and Cenozoic eras.arrow_forward
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