A.The embryo has three primary germ layers
B.Embryo is a hollow ball of cells with a single cell thick wall
C.Embryo has ectoderm, endoderm and a blastopore
D.Embryo has ectoderm, endoderm and a rudimentary nervous system
A.The embryo has three primary germ layers
B.Embryo is a hollow ball of cells with a single cell thick wall
C.Embryo has ectoderm, endoderm and a blastopore
D.Embryo has ectoderm, endoderm and a rudimentary nervous system