Except this isn’t “biology being real”. It’s non empirical. If you abide by the theory of evolution (which I assume you do), then you should be against teleology in biology, since there is no such thing, concretely, as a “body that’s supposed to do things”. It’s just layman speech to inform those that aren’t that far in biology (or to shorten things, since you assume your college knows anyway) “this is one of the possible things that a being (or its system) does in order to survive/reproduce”, not that it is necessary. To imply that it’s necessary would be to imply that nature has a will, or that there is some sort of supernatural will Teleology in biology

Edit: clearing things up and syntax