EBK BIOLOGY: CONCEPTS AND APPLICATIONS
9th Edition
ISBN: 8220100477805
Author: STARR
Publisher: CENGAGE L
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Chapter 16, Problem 2CT
Summary Introduction
To determine:
The geologic time in which humans evolved.
Introduction:
The history of life can be plotted on a clock to determine the geologic time in which the bacteria, flowering plants, mammals, or dinosaurs evolved. For example, Jurassic period is described as the age of dinosaurs.
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The scale of geologic time is difficult for anyone to comprehend, let alone a budding scientist.
The Earth formed 4,600,000,000 (4.6 billion) years ago. To try to understand this time frame,
that each second was equal to one year. There are 31,556,926 seconds in a year. How
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many years would it take you to count to 4.6 billion?
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Based on the given figure, answer the
following questions
(Note: BYA=Billion Years ago; MYA= Million
years ago)
The oldest eukaryote might be dated back to?
Each day represents how many years?
When did the first prokaryotic fossil exist?
When did photosynthesis first emerged?
The multicellular organisms appeared?
~1.5 BYA ~2.5 BYA ~10 BYA
~3.5 BYA
~150 MY
~50 MY
~1 MY
~4.5 MYA ~ 10 MYA
~1 BYA
For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?
Chapter 16 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
Ch. 16 - The number of species on an island usually depends...Ch. 16 - The bones of a birds wing are similar to the bones...Ch. 16 - Prob. 3SQCh. 16 - A trait is adaptive if it _______. a. arises by...Ch. 16 - Prob. 5SQCh. 16 - If the half-life of a radioisotope is 20,000...Ch. 16 - Did Pangea or Gondwana form first?Ch. 16 - Prob. 8SQCh. 16 - Prob. 9SQCh. 16 - Prob. 10SQ
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- It has been suggested that the current time should be made into a different period. In other words, it should not have been part of the Holocene period due to the extreme changes man has made to the earth. If you were a scientist tasked to give a name to the period of today what name would you give it and why?arrow_forwardScientists are examining the possible role of a large asteroid in the Cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and diffusion of sunlight. Which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike? Null: The rate of extinction would be steady over the entire length of time the climate was altered. Alternative: The rate of extinction would be greatest immediately before the asteroid strike. Null: The rate of extinction would gradually decrease over the entire length of time the climate was altered. Alternative: The rate of extinction would be at its lowest immediately after the asteroid strike. Null: The rate of extinction would be steady over the entire length of time the climate was altered. Alternative: The rate of extinction would be greatest immediately after the asteroid strike. Null: The rate of…arrow_forwardFor this activity, you will be reviewing the geological time scale in the module readingassignment from the Geological Time chapter in the PRI Digital Atlas of Ancient Life –online textbook and the Earth History chapter from the OER Commons Earth ScienceTextbook. Use the images of the geologic time scales in your readings to help you makeyour Geologic Time Scale concept sketch nstructions:Sketch and label a geologic time scale. Include dates of the following events in EarthHistory on your time scale in the appropriate time period (you may have to look these up onthe internet but most are listed in your readings). First appearance of free oxygen in the atmosphere Earliest fossils Oldest animal fossils Great Dying Extinction (worst mass extinction at end of the Permian Period) – alsoexplain possible causes of this extinctionArchaeopteryx sp. appeared First Flowering PlantsTyrannosaurus rex appeared K-T Extinction event (Dinosaurs died out) – also explain possible causes of…arrow_forward
- Below are some key events that took place during the long history of life on Earth. Arrange them in the correct sequence: First land plants (kingdom Plantae) First eukaryotic life (domain Eukarya) Adaptive radiation of mammals (class Mammalia) Evolution of chloroplasts Cambrian explosion First aerobic organisms (those that utilize cellular respiration) First land vertebrates (tetrapods) First multicellular organisms First living cellsarrow_forwardWhy is it hard to create a timeline of events chronicling Earth’s History?arrow_forwardEarth is about 4.5 billion years old. In order to characterize the events that happened in this very long time scale, scientists have developed the geologic time scale. Here, the age of Earth is divided into (1), which in turn divided into (2), and are further subdivided into (3). The geologic time scale is so-called since the different subdivisions are based on the fossil record.arrow_forward
- Scientists are examining the possible role of a large asteroid in the cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and the diffusion of sunlight. which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike?arrow_forwardMatch each of the following key events in the history of Earth and life with its approximate date, in million of years ago (mya). Options:4600mya,1000mya,4000mya,200mya,6mya,300mya,2500mya,635mya,130mya,150mya,2000mya,500mya,400mya,541mya, 0.15mya First Dinosaurs and mammals First Cell First multicellular organism First amphibians Increase in atmospheric oxygen First Reptiles First hominis Cambrian explosion First birds Homo sapiens (modern humans) First fish Formation of Earth First Animals Rise of flowering plants First eukaryotic cellarrow_forwardList several significant events in the history of life on earth that are associated with the K-T Boundary.arrow_forward
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