tyler_demerhcant wrote:I am an uneducated individual, but I still believe that it is impossible.
In all forms of life, there are no known forms of transitional embryos.
All embryos, despite their characteristics, fall into a specific category. The transistion between two states would be catastrophic.
For example, if an embryo is developed through an external egg, the creature thereafter would be developed from an external egg.
You are confusing two issues here. The location of the embryo is separate from the development of the embryo. Evolution or changes in development deals with the stages an individual goes through in development.
The transition from egg laying to live birth is a separate issue dealing with the anatomy of a fully developed individual. Again a general understanding of evolution is necessary to tackle both these issues.
tyler_demerhcant wrote:Say any reptile. These eggs are produced and then develope externally. If a reptile was transitioning between reptile and a mammal, assuming the reptile lays eggs and the mammal developes these eggs locally, the embryonic state would thus have to transition as well.
The issue is a little more complex than this. Develomental changes are indeed likely but not
because of the transition between egg laying to live birth. The assessment is developmental changes most likely occurred in order for there to be changes in adult anatomy.
Embryonic development would not be drastically effected due to the change in envrionment from egg to womb.
tyler_demerhcant wrote:We know that this would have to occur extremely relevant to the time frame because no known species is found in that transitional stage.
The transition from egg to womb may not as difficult as you think.
There are live bearing worms,sea anemones,aphids,fish,sharks,amphibians,snakes,lizards and mammals.
There are also egg-laying mammals.
tyler_demerhcant wrote:Thus, one would have to conclude one of two things. Either the embryonic state changed completely from one generation to the other, or ( heres the catastrophe) the creature would have to produce both forms of ebryoes, both locally and externally over a very gradual period of time.
This conclusion that an organism needs to reproduce in two different ways is a hasty one. Further study of animal anatomy will reveal other possible pathways.
For example:
An inability to deposit the eggs will cause the eggs to reach full maturation inside the mother. In most cases this will result in a disaster. The shell would not harden unless exposed to air. A pathway can be imagined.
We already covered the posibility that the transition from egg to womb may not be one with great impact to the actual developing embryo.
tyler_demerhcant wrote:The jump from living embryo in one stage to the other would have to also happen in one generation or else both forms would have to be living embryos at the mid-point of the transition, resulting in a creature that both lays eggs and developes them locally.
Again a transition will not effect the embryo. Think about it in terms of a seed. The environment is either the garden or a pot. This can be likened to the egg or the womb. The embro in this case is the seed emerging from the soil. The development of the embryo is no suddenly in jeopardy because the environment in which the development occurs has changed.
tyler_demerhcant wrote:It is clear that no known creature is within that transformation.
Perhaps/ perhaps not...
Here is an
egg laying mammal.
Lots more photos
And here is a
live bearing amphibian.