Fossils Suggest the Egg Came Before the Chicken
https://www.technologynetworks.com/applied-sciences/news/fossils-suggest-the-egg-came-before-the-chicken-327885
https://www.bristol.ac.uk/news/2019/november/animal-embryos.html
The paper is:
Yin et al. (2019) The Early Ediacaran Caveasphaera
Foreshadows the Evolutionary Origin of Animal-like
Embryology. Current Biology. DOI: https://doi.org/10.1016/j.cub.2019.10.057
https://www.cell.com/current-biology/fulltext/S0960-9822(19)31429-0
Yours,
Paul H.