Sap-Sucking Insects Called Aphids Often Occur on Alder Trees

question 47

Multiple Choice

Sap-sucking insects called aphids often occur on alder trees.The aphids excrete sugary honeydew, which is eaten by ants.In turn, the ants protect the aphids from other insects.The aphids and alder trees have a _______ relationship; the aphids and ants have a _______ relationship.

• A) herbivore-prey; mutualistic
• B) predator-prey; competitive
• C) competitive; commensal
• D) parasite-host; commensal
• E) mutualistic; parasite-host

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