At about four days after conception,the zygote consists of about 100 cells resembling a hollow ball known as a(n)

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At about four days after conception, the zygote undergoes several cell divisions and forms a hollow ball of cells called a blastocyst. The blastocyst consists of an outer layer of cells called the trophoblast and a cluster of cells inside the trophoblast called the inner cell mass or embryoblast. This structure eventually implants in the uterus and gives rise to the embryo and placenta.

At About Four Days After Conception,the Zygote Consists of About