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Известно е, че Черно море има рязко изразен аномален характер. Общият му обем е 534 000 куб.км., но само 13% от тях съдържат кислород. Те са сравнително плитък повърхностен слой (до около 200 м.), а в дълбините на морето водата е аноксична (безкислородна) и наситена със сероводород. Дълго време се смяташе, че в тези условия не може да съществува живот.
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