Early in embryonic development, during the 3rd week post-fertilization, the embryo is a flat, disc-shaped organism made up of three layers of pluripotent cel...
附件
長度: 08:17, 發表時間 : 2021-05-15 20:36
觀看次數 : 1,216
Early in embryonic development, during the 3rd week post-fertilization, the embryo is a flat, disc-shaped organism made up of three layers of pluripotent cel...