Biological Evolution Quotes

“Evolution is largely a temporal phenomenon, Merrill. The environment changes, and populations in that environment change in turn, or they languish. Individual organisms don't evolve; populations do. Nature doesn't give a damn about individuals. The only role we play in evolution is surviving long enough to give birth to offspring who are slightly different from us. Some of our offspring will prosper in a changing environment, and some of them will not. As for us individuals, once we've reproduced, nature has no more use for us. We perish along with our ill-adapted young. Death has always been an essential factor in species survival.

Now consider the human race. We are a partial exception to the rule. Unlike other species, we have developed culture. Instead of adapting to a changing environment biologically, we can sometimes adapt to it culturally. If an Ice Age comes along, we don't need to grow fur on our bodies if we invent the fur coat. Culture allows us to adapt to almost any environment, including the harshest, like space. In fact, our cultural adaptation is so robust that it all but obviates the need to evolve biologically.

We are so good at adapting to changing conditions with our knowledge and technology that we may deceive ourselves into believing that we are above nature. But only a fools believes that. Nature always has the last word. A star in our neighborhood could go supernova and wipe out all life in our solar system, and no amount of culture could save us from that. That, I believe, is the main reason you want to seed humanity throughout the galaxy. So as not to have all our eggs in one basket...

The chief difference between biological and cultural adaptation is that while biological evolution doesn't care about individuals, cultural evolution does, often at the expense of the species. Look at how many times we've nearly wiped ourselves out through cultural means: the nuclear bomb, pollution, climate change, the Outrage. We can't seem to help ourselves. Look at what we've done: we've made individuals all but immortal, even when it means we can have no more children. In one stroke, we've eliminated the two key ingredients of evolution: offspring and death. From a biological perspective, we're skating on mighty thin ice.
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...as long as the individual reigns supreme, there's a finite limit to our survival.
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We need a means for the individual, not just the species, to participate in biological evolution, and that's what my project is all about. We need to be able to let our biological bodies die, to have offspring that are molded by the changing needs of the environments we find ourselves in, and yet to serially inhabit these bodies as the same individual. That means we need to be able to move our minds from one body to the next.
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Mine is a singularity in which the obsolete individual is invited to cross over to the new, not simply to die out. The existing person need not die to make room for the newcomer. Anyone can play.”
― David Marusek, Mind Over Ship

“We now know that all extant living creatures derive from a single common ancestor, called the 'Last Universal Common Ancestor' (LUCA). It’s hard to think of a more unifying view of life. All living things are linked to a single-celled creature, the deepest root to the complex-branching tree of life. If we could play the movie of life backward, we would find this microscopic primogenitor at the starting point of biological evolution, the sole actor in what would become a very dramatic story, lasting some 3.5 billion years leading to us.”
― Alex M. Vikoulov, NOOGENESIS: Computational Biology