Thick layers of keratin reduce water loss ... the first reptile evolved from labyrinthodont ancestor. Amniotic egg appears very early in reptilian evolution. Egg has several special extra-embryonic ...

We also learn about the crucial egg membranes, notably the amniotic sac ... Life” details the evolution of eggs but also of egg-laying, which necessitates choosing deposition sites, optimum ...

Thick layers of keratin reduce water loss ... the first reptile evolved from labyrinthodont ancestor. Amniotic egg appears very early in reptilian evolution. Egg has several special extra-embryonic ...