By what mechanism will their dentition, musculature and digestive systems be altered to accommodate this new diet? How will the numbers of the new grazers be kept in check?
With all this heavy grazing going on, what's the grass going to eat, if it can't photosynthesize?
Numbers will be kept in check by God's planning. Photosynthesis is just something that works with this nature, and all processes in the future new earth will work as they should in their new nature. Body systems can rapidly change in a different nature. You seem to be pegged in all thinking to this present state only.
By what mechanism did Lazarus rise from the dead, or people lame all their lives grow healthy legs to walk and leap suddenly? By what mechanism did Jesus rise from the dead? All of these thing involved more than normal physics and laws. When the creator of the universe and all universes wants nature changed, it gets done!
I'm still waiting for evidence of an old Heaven.
The different nature in the pre and early post flood days was not heaven!
There is no credible evidence of worldwide flood.
There is Scripture which is the epitome of credible. There is worldwide legends. There is the KT layer, which may be evidence of that flood year. There is no evidence from science against the flood.
How is "as needed" different from "periodic?"
Well what God needs God gets. Instantly. Your imaginary periods are invented and belief based.
It has history, and a coherent picture of reality based on a stable physics.
Our physics have not much history actually. Science has far less!
What evidence do you have that natural laws are suddenly going to flip?
God says so.
What evidence do you have that our nature is forever! None.
Yes, science calls them predictions. You know, like how the sun will go out one day etc?
Where did you get your degree in astrophysics?
Astrophysics is a con job. Anyone with a degree in that has wasted a lot of time.
What has exposed them? Link?
I exposed them right here and now. Your failure to show them anything but faith based hooey is evidence.
It's easy to declare scientific knowledge bunk, but harder to back it up.
Easy as pie when to foolishness is not backed up to begin with!
Nor do you have any evidence supporting any alternative world-views.
Alternate world vies/beliefs are no excuse for your religious chicanery you call science falsely.
You're religious views are incompatible with the world we experience,
Speak for yourself. My wold does not include sitting down with ancestors of flatworms that science claims! My world does not include traveling (yet) to the far universe, and confirming the beliefs cosmology has about what time is like there or etc.
and you seem to think that if you declare something untrue, it magically becomes so.
That which cannot be supported needs no magic to dance all over it.
You also seem to support an entirely unevidenced reality
I do not find God or Scripture unevidenced. So called science is totally without evidence for it's origin fables.