1. The black rhino is one of the most ____ animals in the world. There are only about 5,000 left today 2. There are three ____ of bears in North America. They are the American black bear, the grizzly bear and the polar bear. 3. Dangerous ____ from factories can kill fish and other animals when they enter lakes and rivers. 4. Smoke from factories can ____ the air and hurt both humans and animals. 5. When new homes are built, it often ____ the areas where animals live. 6. Few people visited the zoo last week ____ the cold weather. 7. I don't like zoos. I prefer to see animals in their ____ environments. 8. Many organizations are working to ____ endangered animals by creating safe places for them to live.

Unlock 3 R&W Unit 1 Reading 1 Vocabulary

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