____________________ are materials and energy in nature that are essential or useful to humans.
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Q63: _ is the natural resources and ecosystem
Q64: Major causes of the environmental problems we
Q65: _ is the contamination of the environment
Q68: The average ecological footprint of an individual
Q70: A single,identifiable source of pollution is called
Q71: _ is the biological science that studies
Q71: A resource such as solar energy that
Q72: _ resources exist in a fixed quantity,
Q72: _ are chemicals necessary for the life
Q73: The three scientific principles of sustainability are
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