请问这段话通顺吗?Water is no doubt the world's most important resour

请问这段话通顺吗?
Water is no doubt the world's most important resource.All lives depend on it:people and animals need it fordrinking and it is essential for plants to grow.Water is a unique natural resource.It is all to know that water is very important for human in the life.so we should keep water from being poluted.In a word,water is the source of the life.Although water covers more than 70% of the Earth,only 1% of the Earth's water is available as a source of drinking.