Many animals of the deep sea are strange-looking creatures. They _____11_____ very different from their relatives in shallower waters. They may have hundreds of kilograms of _____12_____ pressure on every square centimeter of their bodies. We do not feel the pressure of the air on our bodies _____13_____ the pressure from the inside outward is as great as the pressure from the outside inward. Deep-sea animals are fitted to their environment in a _____14_____ way. The inside pressure is equal to the outside pressure.
Most deep-sea animals are very small. Those that get to a meter long are considered _____15_____ . An adult sea animal would have over two and a half million kilograms of pressure on its body at a depth of a kilometer. It is not surprising that most deep-sea creatures are small. 【題組】13. (A) because (B) therefore (C) however (D) moreover
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