Mark was a young man who had always been fascinated by the ocean. He loved to swim, surf, and explore the underwater world. He dreamed of one day becoming a marine biologist, so he could study the creatures that lived beneath the waves.

One summer, Mark took a job as a lifeguard at the beach. He spent his days watching over the swimmers and surfers, but he also took the opportunity to explore the ocean. He swam out to the reefs and watched the fish darting around the coral. He dove down to the sandy bottom and searched…

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