juvenissun
... and God saw that it was good.
- Apr 5, 2007
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Because there were plenty of tetrapods already occupying the terestrial niches... do Dinosaurs ring a bell? When the dinosaurs became extinct at the K-T boundary, what happened? The mammals diversified to fill all the empty niches. Why didn't they do so before? Because the dinosaurs were occupying them. Is this really hard to understand?
Fishes are fishes? Is the midskipper just a fish? What was Tiktaalik? Acanthostega?
Why wasn't there another species doing the same thing? I told you there were many species doing this in the Devonian. It is not clear how many lines from the information we have. Maybe there was only one line, maybe there were more. As I explained before you need Motive and Opportunity both. Whoever has both first, has a "leg up" (pun intended) on the competition. We don't have all the whys for every species. We don't know exactly what gave and its ancestors an advantage over other lobe-finned lines. You wouldn't be satisfied even if we did... would you, Juvie?
OK, we can not see well on what happened in the past. So let's see what happened today. Are all species of mudskippers jumping onto the land today?
If not, do we have good explanations on why some do but some don't? It would be good if you can give an example on one which has not. (or one which did but got wiped out as result)
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