Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 25 - 25.3 - Concept Check: 2

Answer

The main evidence is that all eukaryotes have mitochondria or signs that they or their ancestors once had them, but not all have chloroplasts.

Work Step by Step

The simplest explanation for this, and the most likely, is that mitochondria came first and that later some lineages also acquired chloroplasts.
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