Which of the following is not one of the three keys to keeping water clean? reduction of pollutants effective cleanup of oil and gasoline spills encouraging algae growth proper sewage treatment

Encouraging algae growth

Explanation:

Algae are tiny single celled aquatic plants which are found in colonies over the surface of water body and on the shorelines of the water body. The algal growth restricts the natural flow and circulation in the water body. If the water body consists of high concentration of phosphates and nitrogen this will lead to abundance in the algal growth. The algal bloom is likely to deteriorate the quality of freshwater as it will lead to the depletion of oxygen in the water body. This will likely to affect the aquatic food chain in the water body.

Hence, encouraging algae growth is not one of the three keys to keep water clean.

The following are the three keys which can be used to keep water clean.

Reduction of pollutants.

Effective cleanup of oil and gasoline spills.

Proper sewage treatment.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)