This is an Ivy vine growing on an oak tree. Ivy growing on trees is an example of Commensalism. Commensalism is when two organisms are in a relationship where one benefits and the other isn't harmed but it also doesn't gain anything. The Ivy on the Oak tree benefits by being able to have support for itself so it can get sun better, while the Oak tree doesn't benefit, but it also isn't damaged by the Ivy.
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