If you only had one million dollars to spend on a population of 10,000 people in a village in a developing country, which of the following would have the greatest impact on their health?
A) Creation of reliable source of clean water, proper sewage systems and maternal health
B) Medical supplies to treat labor-related injuries
C) Import large supplies of nutritious fresh fruits and vegetables
D) Take samples of the water and local foods to identify sources of industrial toxins and carcinogens
A
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When sea levels rise,
A) fresh water on Earth also increases and streams are generally more full. B) fresh water on Earth has flowed into the oceans, so streams are generally less full. C) base levels of river profiles where they reach the sea fall. D) base levels of river profiles where they reach the sea rise.
Biogeochemical cycles involve
A) only biological processes. B) heat loss from both respiration and photosynthesis. C) only geological and chemical processes. D) the cyclic movement of materials through all planetary ecosystems.
________ is produced by evaporation from a warm-water surface into the cool air above; often found over lakes and rivers.
Fill in the blank(s) with the appropriate word(s)
When you shake fish food into in an aquarium, you are contributing to a(n)
A. open system. B. closed system. C. negative feedback system. D. positive feedback system.