Question

multiple choice question
differentiation is when:
the ovary releases the ovum
a cell begins to replicate
a cell becomes specialized for a particular function
the chorion begins to contribute to development of the placenta

Explanation:

Cell differentiation is the process by which a cell becomes specialized for a particular function. For example, stem cells can differentiate into various cell types like muscle cells, nerve cells. The release of ovum from ovary is ovulation. Cell replication is the process of cell division (like mitosis or meiosis). The chorion contributing to placenta development is part of pregnancy - related processes in mammals but not cell - differentiation.

Answer:

a cell becomes specialized for a particular function