Reptiles exhibit remarkable reproductive diversity, with many species giving birth to live young rather than laying eggs.

Over 130 mammal species can delay embryonic development, giving their offspring the best possible chance of survival in ideal ...

Life begins with a single fertilized cell that gradually transforms into a multicellular organism. This process requires ...

Descriptions of the embryo go back at least to the time of Aristotle, but it has only been since the late 19 th century and early 20 th century that advances in experimental approaches allowed ...