Выбрать подходящее.....
Environment                 a)the number of people who live in a country
Population                    b)harmful chemicals and waste , and the damage they cause to the                                           environment
Polson                         c)the land, water and air that people ,animals and plants live in.
Pollution                       d)a substance that can kill or harm you if you can eat it or drink it 

Environment   c)the land, water and air that people ,animals and plants live in. 
Population a)the number of people who live in a country b)harmful chemicals and waste , and the damage they cause to the environment
Poison d)a substance that can kill or harm you if you can eat it or drink it
Pollution b)harmful chemicals and waste , and the damage they cause to the environment