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(Answer: Building filters for air and water).

(Answer: Often due to human hunting or habitat loss). (Answer: Building filters for air and water)

(Answer: Science of our common home, the Earth). (Answer: Building filters for air and water)

: Defining ecology as the "science of the home" (from the Greek oikos meaning house and logos meaning science), which studies how living organisms interact with their environment. (Answer: Building filters for air and water)