BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Textbook Question
Chapter 18, Problem 12SA
Which of the following was not present by the end of
Precambrian?
| a. archaea | c. |
| b. bacteria | d. fish |
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Chapter 18 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 18 - An abundance of___________ in Earths early...Ch. 18 - The first interval of Earths existence is called...Ch. 18 - The prevalence of ironsulfur cofactors in...Ch. 18 - Miller and Urey created a reaction chamber that...Ch. 18 - RNA in ribosome catalyzes formation of peptide...Ch. 18 - By one hypothesis, clay________. a. facilitated...Ch. 18 - Photosynthesis carried out by one group of...Ch. 18 - Mitochondria are most closely related to...Ch. 18 - The presence of ozone in the upper atmosphere...Ch. 18 - A ribozyme consists of ___________. a. clay c. DNA...
Ch. 18 - A rise in oxygen in Earths air and seas set the...Ch. 18 - Which of the following was not present by the end...Ch. 18 - The first chloroplasts evolved from ___________....Ch. 18 - During the Precambrian, _______. a. atmospheric...Ch. 18 - Arrange these events in order of occurrence, with...Ch. 18 - Researchers looking for fossils of the earliest...Ch. 18 - Rickettsia bacteria always live as parasites...
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- Which mechanism of fossil formation created a replica of an organism's original form? a natural cast b amber-preserved c permineralization d trace fossilarrow_forwardScientists find an artifact next to an index fossil. What can they conclude about the unknown age of the artifact? a The artifact is older than the index fossil. b The artifact is younger than the index fossil. c The artifact is approximately the same age as the index fossil. d The artifact's age is not related to that of the index fossil.arrow_forwardThe first forms of life on Earth were ________. a. plants b. microorganisms c. birds d. dinosaursarrow_forward
- The genus Homo dates back to about____. a. 3.9 million years ago b. 1.8 million years ago c. 250,000 years ago d. 2.8 million years agoarrow_forwardDuring which part of the Cenozoic Era did glaciers cover mountains and large of amounts of ice form, causing the sea level to drop and allowing organisms to migrate to new areas? a toward the middle of the Mesozoic Era b at the beginning of the Tertiary Period c toward the end of the Tertiary Period d at the beginning of the Quaternary Periodarrow_forwardThe fossil record provides evidence for: A.When organisms lived on earth B. How some species have gone extinct C.How species evolved D. All of the abovearrow_forward
- Which evolutionary pattern is represented by the similarities between these two organisms that live on separate continents? a.) coevolution b.) convergent evolution c.) directional evolution d.) divergent evolutionarrow_forwardOn the geologic time scale, life originated in the_____ . a. Archean c. Phanerozoic b. Proterozoic d. Cambrianarrow_forwardThe Upper Paleolithic / Later Stone Age includes____ that are characterized by____. a. Mode Ill tools; mostly blade tools that are very specialized b. Mode VI tools; very specialized ground stone tools c. Mode V tools; very organized production techniques used with hafting d. Mode IV tools; very diverse and specialized blade toolsarrow_forward
- According to the fossil record the first evidence of life was ___ years old: a) 3.5 Billion b) 4.5 Billion c) 2.5 Billion d) 3.5 Million e) 2.5 Millionarrow_forwardThe term “Cambrian explosion” refers to (a) an increase in biodiversity. (b) a mass extinction. (c) an atmospheric detonation due to increasing gas concentrations. (d) an oceanic eruption caused by underwater volcanic activity.arrow_forwardApproximately when did life first appear on land A. 500 million years ago B. 2 billion years ago C. 700 million years D. 1.5 million years agoarrow_forward
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