Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337670319
Author: STARR
Publisher: Cengage
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Chapter 16, Problem 10SQ
Summary Introduction
Introduction: Geological time scale is the total life span on the Earth from its origin. It is also called as the calendar of the earth, as it explains the relationships and timing of events that have taken place during the Earth's history. It can relate the rock layers with the time interval. The events are mainly classified into eons, eras, periods and epoch. The eras are mainly divided into 4- Cenozoic, Mesozoic, Paleozoic, and Archean.
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On the geologic time scale, life originated in the_____ . a. Archean c. Phanerozoic b. Proterozoic d. Cambrian
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Chapter 16 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 16 - Discovery of Iridium in the KPg Boundary Layer In...Ch. 16 - Discovery of Iridium in the KPg Boundary Layer In...Ch. 16 - The number of species on an island depends on the...Ch. 16 - Evolution ________. a. is change in a line of...Ch. 16 - The process in which environmental pressures...Ch. 16 - The dinosaurs died out ______ million years ago.Ch. 16 - The bones of a birds wing are similar to the bones...Ch. 16 - A trait is adaptive if it ______. a. arises by...Ch. 16 - Darwin and Wallace proposed the hypothesis that...Ch. 16 - Prob. 8SQ
Ch. 16 - Which of the following is not a fossil? a....Ch. 16 - Prob. 10SQCh. 16 - If the half-life of a radioisotope is 20,000...Ch. 16 - Prob. 12SQCh. 16 - On the geologic time scale, life originated in the...Ch. 16 - Forces that cause geologic change include _____...Ch. 16 - Match the terms with the most suitable...Ch. 16 - Natural selection makes an adaptive trait more...Ch. 16 - Radiometric dating does not measure the age of an...Ch. 16 - If you think of geologic time spans as minutes,...
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- Forces that cause geological change do not include _______. a. erosion d. tectonic plate movement b. natural selection e. wind c. volcanic activity f. meteorite impactsarrow_forwardThe first interval of Earths existence is called the ________. a. Cambrian c. Proterozoic eon b. Hadean eon d. Archean eonarrow_forwardWe live in the Cenozoic era, and scientists know more about this era and the epochs it’s divided into than any other time period. Why is this? A. We know more about the Cenozoic era because this is the only era that has had a wide diversity of species living on Earth. B. We know more about the Cenozoic era because this is the most recent time period in the history of the Earth, and we have more information available to study. C. We know more about the Cenozoic era because the planet’s poles reversed magnetic fields at the beginning of this era. D. We know more about the Cenozoic era because fossils don’t exist to document previous eras.arrow_forward
- The fossil record shows that in just the last 600 million years, there have been five instances of sharp decreases in the diversity and abundance of living organisms. what are these events? a. droughts b. mass extinctions c. reversals of the earth's magnetic field d. great migrationarrow_forwardEnergy, the absence of molecular oxygen, chemical building blocks, and time were the requirements for (a) chemical evolution (b) biological evolution (c) the Cambrian radiation (d) the mass extinction episode at the end of the Cretaceous period (e) directed evolutionarrow_forwardWhich of the following is characteristic of the end of the Paleozoic Era? a There was a mass extinction that eliminated 70% of marine life. b All of Earth's landmasses are joined together in a supercontinent called Pangaea. c Mountains began to form. d The supercontinent Pangaea separated into present-day continents.arrow_forward
- Plate tectonics can contribute to a. volcanoes and earthquakes. b. formation of supercontinents. c. increased weathering and CO2 sequestration.arrow_forwardWhich of these geologic time periods have been defined by a major extinction event? Select all that apply. A. Permian B. Jurassic C. Quaternary D. Cretaceous E. Cambrianarrow_forwardThe distribution of organisms across Earth is known asa. biogeography.b. uniformitarianism.c. paleontology.d. evolution.e. strata.arrow_forward
- Flowering plants and mammals diversified and became dominant during the (a) Paleozoic era (b) Mesozoic era (c) Cenozoic era (d) Devonian period (e) Cambrian periodarrow_forwardWhich of the following evidence supports the concept of continental drift? Select all that apply. A. The discovery of large seafloor ridges and trenches formed via plate tectonics B. Fossils of the same species found in similarly aged complex rock formations across the globe C. The finding that magnetic poles of major rock formations always align north to south D. The discovery that magnetic poles of major rock formations do not always align with the Earth’s magnetic polesarrow_forwardThe most severe mass extinction event, linked to the formation of Pangaea and massive volcanic eruptions, occurred at the end of the _______ period. Group of answer choices a Devonian b Triassic c Cretaceous d Ordovician e Permian People value biodiversity for all of the following reasons except a food, fiber, and medicine. b the acceptance that extinctions are part of a natural process. c opportunities to study and understand the world they live in. d aesthetic pleasure from interacting with other organisms. e functioning of ecosystems and the benefits they provide.arrow_forward
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