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.

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The aphids and alder trees have a herbivore-prey relationship, as the aphids feed on the sap of the trees. The aphids and ants have a mutualistic relationship, as the aphids provide the ants with honeydew in exchange for protection.

Sap-Sucking Insects Called Aphids Often Occur on Alder Trees