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i dont understand this question what am i supposed to answer
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the answer is
b. it carries blood towards the heart
The water will move out of the fish by osmosis due to existence of concentration gradient .
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There is no actual way that the mantle could be...'exposed' or 'seen'. But scientists have managed to find multiple ways to analyze the mantle and it's actual existence by using multiple devices. The mantle is basically a 2,900 kilometers (1,802 miles) thick blocks of rocks and minerals underneath the crust(or the surface of the earth) , and makes up a whopping 84% of Earth's total volume.
