The amnion of mammalian embryo is derived from
(a) ectoderm and mesoderm
(b) endoderm and mesoderm
(c) mesoderm and trophoblast
(d) ectoderm and endoderm
(a) ectoderm and mesoderm
(b) endoderm and mesoderm
(c) mesoderm and trophoblast
(d) ectoderm and endoderm