Answer:
Differentiation is taking place to create cells with specialized functions.
Step-by-step explanation:
Cell differentiation is the term used to describe the set of processes that transform embryonic cells into other types of cells that are specialized in a specific function within an organism.
After fertilization occurs and the zygote is formed, the first cell differentiations begin to occur. This is because, the cells will begin to give rise to embryonic attachments, tissues, and embryo organ. For this reason, just after a chicken embryo begins to grow, its cells start to look different.