Which of the following is an example of a natural resource?
a. water
b. ice
C. oxygen
d. all of the above
Please select the best answer from the choices provided

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Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere