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
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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
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Life first appeared on Earth ___________ of years ago.Choose one:
A. billions
B. hundreds of thousands
C. thousands
D. millions
Radioisotopes are useful in dating fossils and rocks because
a.
they are present in very high amounts.
b.
they decay rapidly.
c.
they decay in a predictable pattern over long time period.
d.
their rate of decay changes over time.
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
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,...
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