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Lester Brown points out that the earth's four principal biological systems — fisheries, forests, grasslands and croplands — form the foundation of the global economic system and supply most of our raw materials. When human claims on these systems reach an unsustainable level, fisheries collapse, forests disappear, grasslands turn into wasteland, and croplands deteriorate. According to the passage, the earth's four principal biological systems are:
Afisheries, forests, grasslands and croplands
Bminerals, petroleum, water and air
Ccrops, cattle, poultry and fish
Doceans, rivers, lakes and ponds
Answer & Solution
Correct answer: A. fisheries, forests, grasslands and croplands
The passage names fisheries, forests, grasslands and croplands as the four biological systems.
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