Relationship between environment variables (climate, topography, drainage) and incidence of disease
Physical features of a place — its climate, landscape shape, and water drainage — directly affect which diseases occur there and how many people catch them.
Real World
After the 2010 Haiti earthquake, collapsed drainage infrastructure created pools of stagnant water; a cholera outbreak followed within months, infecting over 800,000 people — illustrating how topography and drainage failure can trigger disease.
Exam Focus
Link the environmental variable to the specific disease mechanism (e.g. standing water → mosquito breeding → malaria) rather than stating the association without explanation.
Essay Framework
Use PEEL to structure every paragraph. Tap each step for guidance and an example.
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