Answer:
1. Population changes of trees can be harmful to human or animals.
2. Changes of population of trees can make a lack of habitat of many animals in the forest.
3. It can make the people lack of protection from flood's or hotness.
4.Changes of population of trees can reduces the materials for making new one.
5. It can make the people's sad and stressed.
Explanation:
Trees are important for the lives on Earth.