The age-old debate of whether the chicken or the egg came first is explored through historical and evolutionary contexts. Eggs, appearing millions of years ago, predate chickens. However, the ...

Amniotic egg appears very early in reptilian evolution. Egg has several special extra-embryonic membranes, which allow it to develop on land independent of water. Just as significant as evolution of ...

Modern amniotic eggs vary considerably in shape and size and it is believed this variety may reflect the different patterns of egg formation and development in these taxa. Dr Deeming added: ...

These kinds of eggs are called amniotic eggs because of the way they keep the gestating fetus encased in “private pond,” as Professor Michael Benton, professor at the University of Bristol and ...

With amniotic eggs showing up roughly 340 million or so years ago, and the first chickens evolving at around 58 thousand years ago at the earliest, others believe the safe bet is the egg came first.

Most biologists will answer confidently when asked "which came first, the chicken or the egg?" but the answer may depend on what type of egg you're talking about.

The earliest amniotic eggs contained large amounts of yolk, says James R. Stewart, a reproductive physiologist at East Tennessee State University. “You still see that in birds, crocodilians, and ...

The amniotic egg consists of a suite of fetal membranes, including the amnion, chorion and allantois, as well as an external shell that can be either strongly mineralized (as in rigid-shelled eggs ...

Human amniotic fluid stem cells (hAFSCs) harbor high proliferative capacity and high differentiation potential and do not raise the ethical concerns associated with human embryonic stem cells. The ...