Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 16, Problem 7SQ
If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is ______ years old.
- a. 15,000
- b. 26,667
- c. 30,000
- d. 40,000
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
The most useful method for dating ancient calcium rich cave deposits would be
Group of answer choices
A: Argon-Argon Dating
B: Paleomagnetic Reversals
C: Electron Spin Resonance Dating
D: Uranium-Thorium Dating
E: Potassium-Argon Dating
Most of the mercury emitted in South and Central America was through ______?
A.)artisanal and small-scale gold mining
B.)fossil fuel ,combustion
C.)metal production
D.)cement production
Which of the following was likely MOST important for life to begin existing on Earth?
A.
sunlight
B.
DNA
C.
a source of oxygen
D.
a source of energy
Chapter 16 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 16 - The number of species on an island depends on the...Ch. 16 - Prob. 2SQCh. 16 - Prob. 3SQCh. 16 - A trait is adaptive if it ______. a. arises by...Ch. 16 - Prob. 5SQCh. 16 - Discovery of Iridium in the K-Pg Boundary Sequence...Ch. 16 - Prob. 2DAACh. 16 - Which of the following is a fossil? a. an insect...Ch. 16 - If the half-life of a radioisotope is 20,000...Ch. 16 - Prob. 8SQ
Ch. 16 - The dinosaurs died out ______ million years ago.Ch. 16 - On the geologic time scale, life originated in the...Ch. 16 - Prob. 11SQCh. 16 - Forces that cause geologic change include ___...Ch. 16 - Radiometric dating does not measure the age of an...Ch. 16 - If you think of geologic time spans as minutes,...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Sea turtles have disappeared from many regions, and one way of trying to save them is to reintroduce them to ar...
MARINE BIOLOGY
6. How can you use the features found in each chapter?
Human Anatomy & Physiology (2nd Edition)
Why is it necessary to be in a pressurized cabin when flying at 30,000 feet?
Anatomy & Physiology
Consider the experiment described in Section 2.1 in which Ted Garland and colleagues bred mice to run long dist...
Evolutionary Analysis (5th Edition)
Which of the following would be used to identify an unknown bacterial culture that came from a patient in the i...
Microbiology Fundamentals: A Clinical Approach
Review the Chapter Concepts list on page 422. These all center on quantitative inheritance and the study and an...
Essentials of Genetics (9th Edition) - Standalone book
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
Which item is best dated using the potassium-argon (K-Ar) method?
Group of answer choices
A: Cave layers in South Africa
B: stone tools
C: Ancient dinosaur bones
D: organic materials
E: Lava flows found in the Olduvai Gorge
arrow_forward
The Miller experiment consisted of various gases, believed to have been present in the early atmosphere of Earth, exposed to an electrical arc. This experiment resulted in
a.
nothing.
b.
carbon dioxide gas and water vapor.
c.
amino acids.
d.
rain.
arrow_forward
Life first appeared on Earth ___________ of years ago.Choose one:
A. billions
B. hundreds of thousands
C. thousands
D. millions
arrow_forward
Volcanic ash can be used to date fossil finds because each time it is expelled by an eruption it has the same relative proportions of radioactive isotopes.
True or False
arrow_forward
In the Urey-Miller experiments with the origin of life forms, what was the purpose of the electric sparks passed through a mixture of gases?
Group of answer choices
simulate lightning
simulate sunlight
simulate temperature
produce rain from clouds
sterilize the gases
arrow_forward
Radiometric dating is a technique used to determine the age of rocks. Geologists have used this technique to determine that:
A.
The universe started with the "Big Bang."
B.
Earth is about 6.2 trillion years old, and life appeared on Earth about 4.9 trillion years ago.
C.
Earth is about 4.6 billion years old, and life appeared on Earth about 4.1 billion years ago.
D.
Earth is about 4.6 million years old, and life appeared on Earth about 4.4 million years ago.
E.
Earth is about 6.2 thousand years old, and life appeared on Earth about 6 thousand years ago.
arrow_forward
Which of the following do not provide evidence that a meteor strike was a partial cause of the Cretaceous-Paleogene mass extinction?
a.
A potential meteor crater off the coast of Mexico
b.
High layers of iridium in soil deposits in the geologic record at that time
c.
Shocked quartz was formed in large quantities at that time around the potential impact site
d.
An ozone hole appeared in the atmosphere at the time of the meteor strike
arrow_forward
Choose which word best fits the blank.
Large amounts of iridium were found at the K–Pg boundary not only in Denmark and Italy, but in other areas of the globe as well. This suggested that the asteroid was likely large in size and had _______ impact.
A. an insignificant
B. a catastrophic
arrow_forward
About how much mercury was emitted by fossil fuel combustion in Asia?
A.)340 tons
B.)0 tons
C.)40 tons
D.)525 tons
arrow_forward
The first forms of life on Earth were ________. a. plants b. microorganisms c. birds d. dinosaurs
arrow_forward
Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked skeptically at these meteorites because
a.
their results suggest unusual chemical signatures that do not indicate life.
b.
features thought to be Martian fossils could be nonbiochemical formations.
c.
it is impossible for a piece of the Martian surface to fall to Earth.
d.
both a and b are true.
arrow_forward
The earliest evidence for life is closest to what age? OA. 5.4 Ga OB. 15 Ga O C. 600 Ma OD. 3.25 Ga
arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Necrosis vs. Apoptosis: Cell Death; Author: AMBOSS: Medical Knowledge Distilled;https://www.youtube.com/watch?v=zFrBwGfOQs0;License: Standard Youtube License