What Feature(s)distinguish an Embryo from a Zygote

Question

What feature(s)distinguish an embryo from a zygote?
A)The cells of an embyro are diploid, whereas those of the zygote are haploid.
B)A zygote consists of a single cell, whereas an embryo is multicellular.
C)An embryo has differentiated to the extent that rudimentary organs are present, whereas a zygote's cells are still undifferentiated.
D)both a and c

Accepted Answer

A zygote is a single cell resulting from the fusion of sperm and egg, while an embryo is a multicellular organism that has gone through some differentiation and has rudimentary organs. Therefore, the most distinguishing feature between an embryo and a zygote is the number of cells they possess.