Describe the process of how one or two embryos are inserted into the mother's uterus during IVF treatment.

During IVF treatment, after fertilization occurs in the laboratory, one or two embryos are selected based on their quality. These embryos are then carefully transferred into the mother's uterus using a thin catheter, ensuring that they are placed in a suitable location for potential implantation.

This answer is strong because it clearly outlines the key steps involved in the embryo transfer process during IVF, demonstrating an understanding of the procedure. The question tests the student's ability to describe a specific aspect of IVF treatment.