Answer:
Wastewater treatment
Explanation:
The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water, called effluent, is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water.
More than 60 million years
Answer:
The prefix hetero- comes from the Greek word, héteros, and means "other, different". It is the exact opposite of the meaning of the prefix homo-.
