Answer
A
Work Step by Step
The bird-watcher mainly was using his powers of observation by noting carefully the bird's physical features to try to identify the bird.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 1, The Science of Biology - Standardized Text Prep - Page 31: 4
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