1. Trees have irreplaceable importance to human beings and to our environment.
2. Trees give us clean water to drink, fresh air to breathe, shade, food to humans and animals.
1. An international system of communication through connecting computers and websites is called the internet.
2. Famous encyclopedias and dictionaries are available on the internet. The information about science, economics, sociology, philosophy, religion, geography, geology, cosmology, famous personalities, etc can be received through the internet.