Once the zygote divides into 16 cells, it becomes known as a morula

blastocyst

fetus

embryo

Answer and I will give you brainiliest
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Embryo or C

Explanation:

Hope this helps!

morula

Explanation:

The morula is produced by a series of cleavage divisions of the early embryo, starting with the single-celled zygote. Once the embryo has divided into 16 cells, it begins to resemble a mulberry, hence the name morula (Latin, morus: mulberry).

i'd say that the moon rock is about 2.2 billion years old.