During the germinal period of prenatal development, the fluid-filled sphere that consists of an inner mass of cells that will eventually develop into the embryo is called the:

Match List I with List II regarding prenatal development concepts: List I: a. Organ formation b. Outer layer of cells during germinal period c. Harmful agents causing birth defects d. Inner layer of cells during germinal period List II: 1. Blastocyst 2. Teratogens 3. Trophoblast 4. Organogenesis

What is the specific term used for any environmental agent, such as drugs, viruses, or radiation, that causes damage or abnormalities during the prenatal period?