Evidence that black walnut trees exhibit allelopathy includes
A. the lack of vegetation growing under black walnut trees.
B. the death of hornworms that try to eat black walnut leaves.
C. the symbiotic relationship the trees have with fungi.
D. the ants that protect the trees from herbivory.
E. the morphological changes that occur in response to pathogenic attacks.
A. the lack of vegetation growing under black walnut trees.
The lack of vegetation under the tree would indicate that the plant is releasing chemicals that poison other plants.
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