11. The following are examples of aquatic ecosystem except A. aquarium B. terrarium C. pond D. Sea 12. All organisms depend on others directly or indirectly for food, shelter, reproduction and protection. B. false C. maybe D. sometimes A true 13. Which of the following factors are present in an ecosystem? B. biotic factors only C. biotic and abiotic factors D. none of these A. Abiotic factors only 14. Which of the following is not found in an ecosystem? B. decomposers C. autotrophs D. monostrophe A. heterotrophs 15. A particular place in which an organism lives out its own life is called C. ecosystem D. community B. habitat A niche​