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Which are the earth's principal biological …

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Which are the earth's principal biological system?what is their current ecological status?

Posted by Teresa Kamei 5 years, 1 month ago

CBSE > Class 11 > English Core

2 answers

Abirami Kamalbabu 5 years ago

The earth's four biological systems are fisheries, grasslands,oceans and forests. In protein conscious and protein hunger world, fishes are consumed as protein supply. The forests are cut down for firewood, agriculture,industrial requirements.

Meghna Thapar 5 years, 1 month ago

The earth's four principal biological systems namely, fisheries, forests, grasslands and croplands are the foundation of the global economic system. In addition to supplying food, these systems provide virtually all the raw materials for industry except minerals and petroleum-derived synthetics.

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