Many bromeliads are epiphytes on the bark of tropical trees.They do not tap into the vascular system of the trees,but they collect the nutrient-rich water that drips through the canopy of the trees.This is an example of:

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This is an example of commensalism because the bromeliads benefit from living on the trees by collecting nutrient-rich water, while the trees are not harmed nor benefited by the presence of the bromeliads.

Many Bromeliads Are Epiphytes on the Bark of Tropical Trees