Nối câu lại sử dụng which or who
1. Serena Williams is one of the top tennis players today. She started playing tennis when she was three.
2. The great Barrier Reef is in eastern Austrailia. It's the world's largest coral reef.
3. Fur seals almost became extinct during the 19th century. They are hunted for their fur.
4. Robert Ballard is well-know for discovering the Titanic. He is a deep-sea explorer.
5. The octopus is an intelligent animal. It can change its color to hide from predators.
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