試題詳解

42. During vertebrate embryonic development, which of the following is a key function of the organizer region?
(A) It determines the fate of individual cells by direct contact only.
(B) It initiates gastrulation by forming the primitive streak in all vertebrates.
(C) It provides nutrients to developing cells, similar to the placenta.
(D) It exclusively controls limb formation and patterning.
(E) It directs the formation of body axes through signaling molecules.