1. If there is better protection for tigers, b it has many benefits for local people. 2. When people clear an area of jungle, a they often use the land for farming. 3. If the area of Arctic ice gets smaller, d there won't be many polar bears left. 4. If an animal has a bad injury, e it isn't able to hunt for food. 5. When there is more tourism in an area, c their numbers will probably increase. Final Answer: Sentences 1, 2, 3, 4, and 5 all use the first conditional structure (present simple + will/won't).