Sagot :
1. Tree - b. are erect plants with single woody stem capable of reaching a height 20-25 feet upon reaching maturity
2. Ecological Balance - a. maintaining stable relation between man and animals
3. Pollution - c. to contaminate the environment with man-made waste making it unclean
4. Habitat - e. the place or environment where a plant naturally or normally lives or grows
5. Benefit - d. useful or profitable advantage