Answer
A.
Work Step by Step
Only A. shows aggregation of cells, unlike B.-D. which all live their lives as single cells, though they might at times be in close proximity with other cells of their kind by simple happenstance.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 29 - Protists - Review Questions - Understand - Page 587: 12
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