WHICH_OF_THE_FOLLOWING_IS_AMONG_THE_WORLD‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_MOST_PRODUCTIVE_ECOSYSTEMS_IN_TERMS_OF_BIOMASS_PRODUCTION??$#

• A. Pond ecosystems
• B. Lake ecosystems
• C. Brackish water ecosystems
• D. River ecosystems