The gradual change of a species by adaptation over many generations for purposes ensuring it's survival.

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2
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2answers
222 views

A book where 2-dimensional species evolved on rapidly changing environment

I remember a book that described various lifeforms evolving in the galaxy (and i think may be the overriding theme was extinction). One of them was 2-D species evolved on rapidly changing environment ...
5
votes
1answer
116 views

Artificial life forms surpass humans

What is the title and who is the author of a 1960s science fiction story in which an artificial and miniature life form evolves quickly, is felt to be a threat to humanity, and is eventually bombed ...
8
votes
4answers
370 views

What was the first SciFi work that theorized that Homo Sapiens were seeded on Earth by intelligent aliens?

What was the first SciFi work that theorized that Homo Sapiens were seeded on Earth by intelligent aliens (as opposed to all the other Earth species which evolved separately)? The earliest one I can ...
8
votes
2answers
192 views

How realistic is the physical evolution of the Ousters in Dan Simmons' Hyperion Cantos novels?

I am halfway through Dan Simmons 'Fall of Hyperion' and I was wondering whether there are any expert opinions on how human physicality would change upon living in zero-g. In the Hyperion novels the ...
5
votes
1answer
161 views

How did the Silurians lose their third eye?

In the original series of Doctor Who the Doctor meets the Silurians (Eocenes, Homo Reptilia, Earth Reptile or Indigenous Terrans) which have three eyes, and look like so: On of their most striking ...
9
votes
1answer
195 views

What is the natural prey for headcrabs?

Headcrabs perfectly fit on human heads. But they must have evolved to that point on their home world (which is not Xen, btw.) without humans. How did their food chain look like before they came ...
16
votes
4answers
640 views

What factors influenced the evolution of Klingon cranial ridges?

Many species in the Star Trek universe have "bumpy foreheads"--most famously, the Klingons. What are the likely factors that influenced the evolution of Klingon cranial ridges? Could it be a ...
20
votes
8answers
714 views

How fast should mutations be for hard science fiction?

I was disturbed by the rate of human evolution in Waterworld- maybe 500 years to evolve humans with gills*, and about a 1000 years to evolve into (back into?) something that is stronger than a ...