Question

how do communicable duseases spread by means of air, water and vectors

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Answer 1

Answer:

By contaminated air , because of inhalation

By contaminated water , Because we drink water

By vectors like houseflies and mosquitoes because houseflies can contaminate our food etc. and by bite of mosquitoes :)

Answer 2

Air: sneezing- water droplets- inhalation of these water droplets.
Water: consumption of contaminated water (usually contaminated by deposition of animal excreta)