How is it possible for aphids to feed only on the carbohydrate- rich but nutrient- poor sap

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How is it possible for aphids to feed only on the carbohydrate- rich but nutrient- poor sap of phloem vessels in plants?
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Brock Biology of Microorganisms

ISBN: 978-0321897398

14th edition

Authors: Michael Madigan, John Martinko, Kelly Bender, Daniel Buckley

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