Ex. 3
1. Danger
2. Danger
3. Endanger
4. Endangered
5. Dangerous
Ex. 4
c) People need forests to survive
Ex. 5
1) Scientists worry about the survival of the people, because their activities change the world for the worse, for example they cut down forests.
2) The world is getting worse.
3) People cut down forests, because they need firewood to keep warm.
4) Trees are a vital part of the water cycle and they produce the oxygen that we breathe.
5) When people cut down forests, they kill the plants under the trees as well.
