I want to know the answer to the following question:
What are examples of a cell's external environment?
All the background I'm provided with is that "Genes are regulated so that they are expressed only when the product is needed, since expression draws on limited resources.:7 A cell regulates its gene expression depending on its external environment (e.g. available nutrients, temperature and other stresses), its internal environment (e.g. cell division cycle, metabolism, infection status), and its specific role if in a multicellular organism.". Is that enough to answer the question?