for drinking and for sanitary purposes because it is a precondition for the health and well-being of people.
B.
to wash the cars
C.
to drink
D.
to take a bath
E.
the hunter animals
2.
Why do plants and animals suffer in rivers, lakes and seas?
A.
the hunter animals
B.
by changes in the chemical quality of the water and the physical disturbance of its habit
C.
excessive heat
D.
contamination of the human being
3.
Changes in habitats can be the result of:
A.
throw garbage into the sea
B.
The greenhouse effect
C.
human activities
D.
Physical disturbance through dams, channeling and dredging of rivers, construction of reservoirs, extraction of sand and gravel in coastal waters, bottom trawling by fishing boats
4.
Where does most of the pollution come from?
A.
of homes.
B.
the people
C.
it comes from urban and rural populations, industrial emissions and agriculture.
D.
chemical substances
5.
What are the point sources?
A.
urban wastewater discharges, industry and fish farms.
B.
such as background losses
C.
osses from scattered dwellings and atmospheric deposition on water bodies
D.
lakes
6.
What are the diffuse sources?
A.
the forests and the garbage
B.
global warming
C.
such as background losses (e.g. forests), losses from agriculture, losses from scattered dwellings and atmospheric deposition on water bodies (e.g. marine areas or lakes).
