OK, Viviparity (live-bearing) evolved from Oviparity (egg-laying) to times via egg retention and eggshell thickness due to colder climates.
How Oviparity ended and Viviparity just begun the very first time?
Did the off-spring decided to stop Oviparity, and begins to Viviparity immediately for the next generations to come?
If this is an adaptation to colder climates evolves by transition, there must be a later or final step where the very thin egg is laid vulnerable to cold. (Maybe mother protects it by incubating like birds, or young is ready for cold before laying?)
I cannot find simple explanations, as well as videos and images.
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The reproductive modes
in Evolution, Morphology and Exobiology
Posted
OK, Viviparity (live-bearing) evolved from Oviparity (egg-laying) to times via egg retention and eggshell thickness due to colder climates.
How Oviparity ended and Viviparity just begun the very first time?
Did the off-spring decided to stop Oviparity, and begins to Viviparity immediately for the next generations to come?
If this is an adaptation to colder climates evolves by transition, there must be a later or final step where the very thin egg is laid vulnerable to cold. (Maybe mother protects it by incubating like birds, or young is ready for cold before laying?)
I cannot find simple explanations, as well as videos and images.
Thank you!