In biology, symbiotic<span> refers to any diverse organisms that live together, but in this case, the relationship is not necessarily beneficial to both. Parasites, for example, have a </span>symbiotic<span> relationship with their hosts, but only the parasite benefits.
This is a theory because this has been proven by scientists years ago. The evidences to prove this theory were shown. hope this helps!!! :) Pls mark me BRAINLIEST! :)
