Question

multiple cholce question
the ectoderm layer thickens on the posterior side of the embryonic disc and becomes the
plate.
ectoderm
umbilical
chorionic
neural

Explanation:

During embryonic development, the ectoderm layer thickens on the posterior side of the embryonic disc and forms the neural plate. The neural plate is an important structure in neurulation. The ectoderm is the original layer (not the resulting plate in this context). The umbilical structure is related to the connection between the embryo and the placenta. The chorionic is part of the fetal membrane.

Answer:

neural