Answer
D.
Work Step by Step
An emerging virus is simply one which has come to much greater notice/importance for one of the reasons in A-C.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 19 - Test Your Understanding - Levels 1-2 - Remembering/Understanding - Page 414: 2
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