Define embryology. Where does it occur?

Explanation

**Step-by-Step Solution:**

1. **Definition of Embryology**:
- Embryology is the branch of biology that studies the development of embryos from fertilization to the fetal stage. It involves the processes that occur after the fertilization of an egg, leading to the formation of an embryo through cell division.

2. **Process of Embryology**:
- After fertilization, the zygote (the fertilized egg) undergoes a series of cell divisions known as cleavage or mitosis. This results in the formation of multiple cells, typically progressing from 2 to 4, then to 8 cells, and so on.

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