Answer:
c
Explanation:
can't plant in artic or water
The snow is blowing across highway 53.
The rain is causing the pond to rise
The weather is so nice that no is wearing a coat today.
Bring your umbrella, the rain is falling harder.
Answer:
The required efficiency of BOD5 removal of the plant needs to be at least 91%
Explanation:
Even though a WWTP (Waste water treatment plant) has several unit operations, it needs to have an overall treatment efficiency. In this case, it is only required to know how much BOD5 do we need to lower by removing organic matter from the water. It goes as following:

This will work for any efficiency, for any parameter you need to define. They need to be in the same concentration unit, of course.
Replacing known values, we have:

Which we will approximate to 91%, because decimal percentages do not say anything and are not currently used.
Answer:
Explanation:
1 a process by which nutrients are dissolved in a body of water
Eutrophication
Eutrophication is the process whereby nutrients in excess are brought into a body of water which causes a bloom in the growth of plants.
This is usually as a result of runoff carrying nutrients from farmlands such as fertilizers.
2 the development of higher than normal salt content in the soil
Salinization
Salinization is the dissolution of salts in water. It is often described as the degree of salts in water. When salts contents in soils increases than normal, the soil becomes salinized.
3 the use of leadership positions for personal gain
Corruption
The illicit use of power for personal gain by people in leadership is corruption. This is but one aspect of what corruption entails. Corruption is the abuse of power in leadership position.
4 movement from one place to another
Migration
The movement of people from one place to another is migration. Migration can be movemnet into a country which is called immigration. Emmigration is the movement from a country.
5 isolation from others
Seclusion
Seclusion is the removal from a group of people. It is a form of isolation from others
6 the removal of salt from something
Desalinization
The process of removing salt from something is known as desalinization. Several chemical procedures can be used to achieve this.