the movement of populations (a collective) of people from one area to another; migration is usually a response caused by climate, diminishing foodany nutritious substance that people or animals eat or drink, or that plants absorb, in order to maintain life and growth supplies, warWar:Â A state of armed conflict between different nations or states or different groups within a nation or state., diseasea disease is a disorder of structure or function in a human, animal, or plant that produces specific signs or symptoms, or that affects a specific location and is not simply a direct result of physical injury, or catastrophic natural events (floods, volcanic eruptions, earthquakes); may be by land or by sea, or in today’s world by evacuations
