How is mutualism an example of symbiosis?

Answer 1

Symbiosis is defined as a long-term relationship between different species where, generally, at least one organism benefits. In mutualism, both organisms benefit from their interaction. Mutualism, therefore, does fall under the category of symbiosis.

Answer 2

The epiphytes get a place to live, the trees are not effected. Benefits one, doesn't help or harm the other.