Biology CLEP Prep Practice Exam

The internal environment of a cell is called the cytoplasm. The term "intracellular medium" (option A) refers to the fluid inside cells but is not the specific term used for the entire internal environment. The term "cellular matrix" (option B) refers to the extracellular matrix, which is the space between cells, not the internal environment of a single cell. Option D, "intercellular medium", is the incorrect term because "intercellular" means between different cells, not within a single cell. Therefore, the correct answer is C Cytoplasm.