VI. Answer the following questions.

1. What does an ecosystem consist of?

2. Describe the roles of producers, consumers and decomposers in a food chain.

3. What is a food chain/ web? Give your examples.

4. Describe the role of humans in an ecosystem.

5. What are the main problems connected with human impact on ecosystems?

6. How can people's actions cause global warming?

VII. Match the words with their definitions.

affect (v)	to use sth, especially fuel, energy or time
cause (v)	a situation in which a plant or animal, etc. stops existing
nutrient (n)	material that was formed over millions of years from the remains of animals or plants
fossil fuel (n)	a substance that is needed to keep a living thing alive and to help it to grow
extinction (n)	to make sth happen, especially sth bad or unpleasant
consume (v)	to produce a change in sb/ sth

VIII. Complete the sentences with the words from Ex. IV

1. The bad weather_____ problems for many farmers.

2. Plants draw minerals and other from the soil.

large amounts of

3. The electricity industry

4. The government launched a campaign to save wild koalas from___.

5. Nicotine adversely____ the functioning of the heart and arteries.

IX. Match each noun with suitable adjectives and translate these collocations into
Russian. Make up the sentences with these collocations. _____________________

forest plant species organism

tropical, house, poisonous, different, wild, rare, exotic, aquatic, thick, dark, boreal, living, dense, attractive, extinct, common, rare, wild, threatened, rain, complex, living, medical, simple, endangered, biological, aquatic, growing, aquatic, coniferous

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