How do you know God isn't dead?

[pocaracas]

The first one, mated with the previous homo sapiens. In time, the previous species became recessive and faded away, leaving only the homo sapiens sapiens species.
Do you find it hard to think of new species appearing slowly, over the course of many generations? Do you think a new species appears spontaneously from the offspring of the previous one?

I find it very hard to believe that a member of one species can mate with the member of another species since species are defined (biological concept definition) as groups of animals that cannot produce fertile offspring. What gave birth to the first Human though and why was that animal not also Human? Thanks for the response!

ok.... let's see if I can write this while my work computer is stuck trying to plot 99k points in libreOffice.


Evolution 101
or "how a human does not come from a non-human"

I'm going to give you an example of how evolution works, in broad strokes, and I'll probably cram into one or two generations what, in reality occurs over some 10 or 20... and I'm not going to use humans as basis for it, given that they're too complex and the evolutionary edge that sparks an evolution towards that goal is very spread out over many traits, making the argument very complex and you would easily get lost in details.
Instead, I'm going to use birds. Not a specific species of birds, just a generic bird, let's call it A. This bird is well suited to its life in island X.

For some reason (freak storm, or whatever) a sample of these birds arrives at another island, Y, where their beaks are not very well suited to feed themselves, but still manage the job.
So A survives barely and breeds.
At some point, one offspring of an individual A, is born with a slightly larger beak, say, 1mm longer. Let's call this A1.
A1 can breed with A. Given the better suitability of this larger beak, A1 can feed itself slightly better than the rest, so it survives and manages to breed, as if it was a member of A.
A1 breeds with an A mate.
Their offspring will be majorly A and a few A1s.
Over a few generations, you have a few A1s running alongside As.
Eventually, A1s breed with A1s, producing more As, A1s and another bird with a yet slightly larger beak, 2mm longer, let's call it A2.
A2 can breed with A1s and As.
Interbreeding yields As, A1s and a few A2s.
Eventually, we get another bird with slightly longer beak, 3mm, let's call it A3. A3 can still breed with A, A1 and A2.

With each increment in beak size, the species becomes more proficient at feeding in island Y and so these new generations become dominant, due to their better feeding, they are healthier, survive longer, look better, mate easier.
As become less favorable to mate with and decline in numbers, even if they may mate with A3s. A1s and A2s merely prefer to mate with A3s or A2s, instead of As or A1s.
In time, A5 appears in island Y. A5 can still breed with any of the previous As, but will prefer A4s or A5s.
As and A1s become rare, although As still thrive in island X.

Eventually, you get A10s which are perfectly suited for life in island Y, but, while they can mate with A5s, they will not mate with As.
By now, A10 is a different species from A, lets call them something different, B, but A5 can mate with both.
However, in island Y, all these A1, A2, A3, A4, A5, A6, A7 will tend to become superseded by the A10 and A9 and will quickly recede.

When Darwin comes along, all he sees is As in island X and A10s (or B) is island Y. Two different species, similar, yet unable to breed among themselves.


PS: I'm not a biologist, much less an evolutionary one, so if there's anyone out there that spots some error in this crude explanation, please correct it.