Answer:
By strengthening cardiorespiratory endurance your body will be able to take in and carry more oxygen. This will result in an increased number of red blood cells and hemoglobin. Your heart rate will also become stronger and be able to pump out larger volumes of blood and distribute the oxygen better.
Explanation:
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I am pretty confident that the answer is D) mouthpieces for breathing. This is the only way they can stay underwater for long periods of time. If they came up every 10 seconds for breath, they would waste a lot of time.
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Vegans are especially at risk for B12 deficiency due to the lack of the vitamin in their diet. Vegetarians are also at risk but due to less strict dietary constraints their chances for B12 consumptions are drastically higher <span>than a vegan's. B12 is found primarily in meat, eggs and dairy products.</span>
I'd say C, but A could also work.
