Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 4, Ecosystems and Communities - Standardized Test Prep - Page 127: 5



Work Step by Step

Option A is incorrect. The benthic zone is at the bottom of oceans, lakes, and streams, so there is little light for photosynthesis to occur. Option B is incorrect. In aphotic zones, there is no light for photosynthesis, so these algae cannot survive at these depths. Option D is incorrect. The ocean trenches lie at the bottom of oceans where light does not penetrate. Option C is correct. The photic zone is the top layer of oceans that light can penetrate. Where light can reach is where we will find photosynthetic organisms such as algae.
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