As for what you said, "* * * is born with parasitic saprophy", you have confused the concept. This is an interspecific relationship, that is, it depends on the relationship between human beings and another creature, and we can't just ask which one human beings belong to. For example, humans and animals and plants generally belong to predatory relationship, humans and human parasites belong to parasitic relationship, humans and some animals (such as dogs and animals in nature reserves) belong to biological relationship, and so on. In short, it depends on the relationship with what kind of creatures, and we can't just ask humans.