3. a) Some nouns from below. How many can you find without looking back at the article? the article are missing from the definitions 1) population (n.) [U] - all the people who live in one area, city or country.
2)(n.) [U] - a process of making water, air, soil, etc. dirty.
3)(n.) [U; C] - when sb or sth becomes impossible to see or find.
4)(n) [C] a person who carefully studies the topic to find new facts or information. .
5) (n.) [U]the process of something being made worse
6)(n.) [U]. the state of being safe and protected from danger.
7)(n) [C,U]. a rise in the number
8)(n.) [U] physical harm to something that makes it less attractive or useful.​

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