താഴെ പറയുന്നവയിൽ ദീർഘകാലം നിലനിർത്താൻ കഴിഞ്ഞിട്ടുള്ള ഏറ്റവും ചെറിയ കൃത്രിമ ആവാസവ്യവസ്ഥ (artificial ecosystem) ഏതാണ്?
Aഫോൾസം പോണ്ട് (Folsom pond)
Bഫോൾസം ബോട്ടിൽ (Folsom bottle)
Cഫോൾസം സ്ട്രീം (Folsom stream)
Dഇവയൊന്നുമല്ല
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