you are going to start our discussion about evolution and
mutation again
But u r the one tat start talking about changes of animals after
a period of time. Isn't tat already evolution ?
If u believe in
evolution, then it states tat animals changes very very gradually,
over millions of years to be wat we see today. Tis is really unlike
the changes describe in your explanation tat these major changes
occur in a mere 5000 years
you must note that the ark didnt require a broiler room, engine
room, fuselage, etc.
even if it's just a medium size ship, technically it still can hold
all the animals in there.
Even so, it is again as stated tat the whole species of beetles
already need an ark 10 times the size described. It can't hold all
the animals in there. Tis is especially true since it says tat some
species need 7 animals instead of 2 and also for it to float it
need a lot of empty space.
Noah's Ark isnt really an ordinary Ark. Perhaps God Bless it and
made it float real good.
There is really nothing tat says tat god make the ship real good
tat it defy physics principles
I mean if u totally disregard physics principles and actual
scenario, u might as well just make ultra incredible claims such as
food dropping from the sky, animals suddenly shrink to become germs
size, or better still send the ark to holiday in wonderland before
sending back to earth after the rain. I mean u can just become
totally irrational and come out with anything your imagination can
fetch. If u wanna say tat way, then u r really giving circular
arguments 
If u say tat way, then why don't god make things simple with his
infinite powers by just erasing the creatures he do not want
instead of trying so many stunts such as asking someone to build an
ark, making the animals go to tat ark, finding such a big amount of
water, raining for so long, making the ship float when it should
sink etc
Also, although it rained for 40 days. the flood subsided only
after 150 days.
Doesn't tat make the story more unbelievable...
if half of the animals in there hibernate like what polar bears
and other animals do today, there may just be enough food. Possible
eh?
Lets face it. Most animals don't hibernate.
Anyway u also bring about an interesting question on how does a
creature tat need a cold climate such as polar bear survive with
creatures tat live in hot climate stay together in a ship. Animals
do die if u put them in the wrong environment and climate