When does a zygote become an embryo?
A)when the heart starts beating
B)when myelination begins
C)when it attaches to the uterine wall
D)when it is fertilized by a sperm cell

Question

Quizplus · Accepted Answer

A zygote becomes an embryo when it attaches to the uterine wall and begins to develop into a multicellular organism. Prior to this, it is still considered a single-celled zygote. The heart beating and myelination are later developmental stages in embryonic development, and fertilization by a sperm cell is what creates the zygote in the first place.

When Does a Zygote Become an Embryo