Answers

2015-07-23T15:41:35+08:00
To produce oxygen,to give fresh air,to prevents floods
1 5 1
thank you for sharing your knowledge...
2015-07-23T16:15:46+08:00
We need to plant tree because tree give us food,oxygen,like the fresh air ,materials especially in paper,woods and manymore.
1 5 1
thank you for giving your opinions...