When an embryo (fertilized egg) reaches the uterus, it is a hollow ball of about 100 cells called a blastocyst.
blastula
the hollow ball of cells is called the Blastocyst. At which point this occurs depends on the particular species.
a hollow ball of cells. novaNET
A blastula is a hollow round clump of cells, one of the early stages of embryo development.
When an embryo (fertilized egg) reaches the uterus, it is a hollow ball of about 100 cells called a blastocyst.
blastula
the hollow ball of cells is called the Blastocyst. At which point this occurs depends on the particular species.
A blastula is an early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid.
Blastula.
the morula develops into a hollow, fluid-filled ball of cells called a blastocyst.
a hollow ball of cells. novaNET
a hollow ball of cells. novaNET
A solid ball of cells is called a morula. A morula is an embryo that is at an early stage of embryonic development.
an embryo
A blastula is a hollow round clump of cells, one of the early stages of embryo development.
Blastocyst.