Ok I will make a go at it given some of the things I know about the natural world.
Evolution claims that at one point all animal life lived in the oceans or fresh water bodies and at some time moved on to land.
So one would guess that there are species that demonstrate a half way point between aquatic and land bassed existence.
Well the good news is there are species in the animal kingdom that do demonstrate this for example
the Christmas Island crab spends most of its life on land in the rainforest's of Christmas Island.
However this species of crab has not completely severed it's ties to it's aquatic ancestors it must still return to the ocean
to spawn. The larvae of the crab must still undergo part of their development in an aquatic environment.
Next up is Amphibians like frogs, salamanders, and newts. Each of these species begin their life cycle in the water where they are dependent on gills
to breath only latter do they develop legs and eventually lungs to breath
on the land.
Amphibians would seem to be at a midpoint between fish that spend there entire life in water and reptiles which spend their entire life on land and
are not dependent on water for their developmental life cycle.
However some amphibians do not let go of their gills and keep them their entire life.
Like this little fellow the Axolotl
Last example the snakehead.
This fish is an invasive species yet it has an evolutionary advantage that gives it an edge.
It has a primitive lung and can live out of water for up to 3 days and move on land!
Just some examples that I think make a strong case for evolution.
cheers
edit on 28-12-2010 by ELahrairah because: (no reason given)
edit on 28-12-2010 by ELahrairah because: (no reason
given)