I have to disagree with you on the parasites being necessary as a whole. Most parasites are exactly that and not so symbiotic other than out competing “bad” parasites if anything. There are “good” bacteria’s that have been proven necessary for many animals and plants for a healthy life. The larger parasites that infect the body could have infected a single species or local of species for millions of years, those species have had that time to adapt through death only, as they gained defenses and the parasite gained offenses. Of course there is more to this depending on the individual. But say you take a parasite from Africa, and drop it into a Malaysian Dragon, there is a good chance they have never adapted to each other…since the parasite is actually adapting to its host as not to kill, but take all nutrition it can at the same time. With this being the goal of the parasite, they are taking much needed nutrition from their host even if they are working things out.
I like to compare our bodies to continents. If you introduce an invasive species into say Australia, it will start to destroy the Country…i.e. an Island will be destroyed much faster. Also the more secluded that Continent has been in the past and smaller it is, the more likely it has no resistance to the attack. I think this goes for parasites to individual animals, plants, reptiles etc.

Jobi, these are strong beliefs but I understand your point as well, so please don’t hate me for my opinion is so different. I would like to hear what you think about this.

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