There is no doubt speciation is a fact. The question is does it result in a new species. The inability to reproduce does not constitute a new species. This can be caused by to much interbreeding. In the ring species of salamanders, the salamanders remained salamanders, That is not evidence of evolution.
Sure it is. Not just salamanders either of course, Herring Gulls and the Caribbean slipper spurge Euphorbia tithymaloides are great examples too - you have to agree that where they meet again at opposite ends of the ring, they are morphologically unique too - not just genetically incompatible. This is proof that these organisms diverge genetically, and will continue to diverge, left unchecked. Check out Fig. 3 at
The Caribbean slipper spurge Euphorbia tithymaloides: the first example of a ring species in plants. - PubMed - NCBI, it shows that these two have diverged so much as to be different species, even though they show an imperceptible graduated change as you follow the ring species around from end to end, even though they are undeniably different when they meet again.
The usual example given for the evolution of bacteria is that some seem to become a new species based on their ability to resist antibiotics. For all we know some of them already had that ability or they would have died from the antibiotics. In any case, the bacteria, like the salamanders remained bacteria. No evolution.
Way more than bacterial resistance, I'm afraid. The Lederberg Experiment:
https://evolution.berkeley.edu/evolibrary/article/side_0_0/lederberg_01 lent great support to the Theory of Evolution though this experiment (and against ID too, mind you). If you so much as looked marginally further into the bacteria kingdom for examples of Evolution than a cursory glance, you'd notice bacteria do indeed enjoy a swathe of unique changes in their genomes bringing about complex traits requiring a number of steps (for which we can indeed 'know' how they came about), much of it by chance to achieve these novel traits:
Bacteria make major evolutionary shift in the lab - even if we hadn't seen the citrate digestion trait appear in e-coli (among others), the genetic change in these bacteria are so diverse that we regularly find as much genetic change as we see between us and say, Giraffes from the same genetic stock - it's likely why there's more bacterial species than there are animal and plant species put together. It's trivial to have them evolve into something unique enough to be a separate species all of its own in a matter of months - the same genetic uniqueness to become humans of today took us hundreds of thousands of years - we can see that change in bacterial species well within a lifetime.
I can hear it now "
...but they're still just bacteria!" - Just like humans, spiders, coral sponges and banana trees are still just eukaryotes...
The evolution tree is as a joke because you have no fossil links joining any of them to each other. I thought evolution had even abandoned that in the theory.
Why don't you explain how the leg of a land animal can become the fin of a sea creature. Genetically of course. Maye you can include how and why land animal surviving quite well on land could become a sea creature. That refutes natural selection, another evolution fantasy that should start with "one upon a time."
Not in the least, an opportunity to come by food easier gives rise to unique traits that make gathering that easier food source.... well, easier. That's only one on any number of reasons for the change though, not like anyone was around to take a poll or anything... Anyhoo:
Also, this has been covered here on these forums already:
Then...
A cursory glance over these various articles shows the rear limbs primarily governed by the Hand2/SHH and the forelimbs by Hoxd12 and Hoxd13. In both cases, the evolutionary dependence and change sequence has been well documented. Seriously, it's almost as if you're deliberately avoiding the evidence or something...