Question

Water is an intergral part of life ( on/at/in/for) this planet. Most of the water on earth (was/has/is/had) salt water. We can remove salt ocean water (so/since/as/but) the process is very expensive

Answer 1

Water is an integral part of life on this planet. Most of the water on earth is salt water. We can remove salt ocean water but the process is very expensive.