Survivalism and hedonism are doctrines surrounding fitness maximization and pleasure maximization respectively.Both schools vary along the individualism / collectivism axis. Survivalism ranges from individualists, who are out for themselves through those who profess to be against the extinction of our species. Similarly, hedonists vary from those out for their own pleasure, to those who think the total pleasure of all sentient beings is what is important.
Hedonists think they are more advanced than survivalists. They are further up in Maslow's hierarchy of needs. They view animal evolution as a transition away from basic survivalist goals towards more advanced optimization targets dictated by nervous systems. In turn, survivalists view hedonists as short-sighted folk prone to drug-taking, masturbation, casual sex, wireheading and other dubious activities oriented towards pleasure and often at the expense of basic survival. See the picture, for more examples.
For a while, I considered these teams' rivalry to be largely misplaced. Hedonists who neglected survival were short-sighted fools likely to end up with nothing. Only hedonists who recognised that hedonism depended on survival really needed to be taken seriously. However, such hedonists would be likely to behave a lot like survivalists until they were pretty certain that they were not going to encounter more advanced alien civilizations in the alien race. That might well be tens of millions of years in the future. If the two tribes behave in much the same way for billions of years, they don't seem too dissimilar.
I'm now a bit less confident of this assessment. Hedonists might think that alien races would also be hedonistic - and so might not be too concerned about the consequences of an alien invasion. I can also imagine a hedonist gambling on extinction vs making everyone three times as happy forever. A survivalist would be unlikely to take such a gamble - but possibly a hedonist might.
It also seems that in practice that the different optimization targets do result in different behavior. For example, they differ regarding treatment of non-human animals. Many hedonists are concerned with animal welfare causes: factory farming, wild animal suffering and so on. However, to survivalists these mostly look like bad causes: non-human animals are probably not going to help make sure that Spaceship Earth completes its journey. This kind of practical difference today does not bode terribly well for the thesis that the behavior of these tribes will converge in the future. Maybe the survivalists and the hedonists will remain at odds.
How do parasites avoid destruction at the hands of the host immune systems? Of course there are many ways, but one way is to pretend to be part of your host. Viruses are experts at this. They hide inside host cells, out of the way of the immune system. However the immune system has a window to cell contents the form of the major histocompatibility complex (MHC) proteins, which are detectable from outside the cell. Some viruses, for example cytomegaloviruses synthesize families of human-like proteins to fool the immune system into thinking that the host cell is still mostly human.
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One fairly prominent critic of "chemical evolution" was the late 
