Answer
a. a drop in death rate due to sanitation and health care.
Work Step by Step
Skyrocketing growth of the human population appears to be mainly a result of a drop in death rate due to sanitation and health care.
Campbell Biology: Concepts & Connections (9th Edition)
by Taylor, Martha R.; Simon, Eric J.; Dickey, Jean L.; Hogan, Kelly A.; Reece, Jane B.
Published by
Pearson
ISBN 10:
0-13429-601-X
ISBN 13:
978-0-13429-601-2
Chapter 36 - Review - Page 741: 8
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