Answer the following question given this paragraph: 

Cells divide repeatedly to produce an embryo. Previously the one-celled zygote (the first cell of a new organism) divided to make two cells (a). Each of the two cells divides to yield four cells (b), then the four cells divide to make eight cells (c), and so on. Through cell division, an entire embryo forms from one initial cell.


Q: What do you call the first cell of a new organism?

 Choices:

- embryo

- starter cell

- egg

- zygote

A:
zygote
