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20. Fill in the words.
Biosphere, exchange, abiotic, relationships, communities, habitat, en-
vironment, biotic.
Ecosystem means organisms living in a particular 1) _______________,
such as forest or coral reef, and physical parts of the environment that affect
them.
The ecosystem concept was developed by scientists to simplify the
study of the 2) _______________ of the organisms and their physical envi-
ronment. At the top of the hierarchy is the planets entire living environment,
known as 3) _______________. The living or 4) _______________ parts of
n ecosystem live in 5) _______________. The physical surrounding or 6)
_______________ components such as minerals found in the soil are known
as the environment or 7) _______________. All ecosystems show a constant
8) _______________ of matter and energy between biotic and abiotic com-
munities.
21. You will read the text “BIODIVERSITY”. Before you read do the
tasks below.
A. Suggest your answer to this question.
How many species live on Earth?
B. Look through the text and check if your answer is correct.
C. Read the explanations and guess the verbs.
to survive – to continue life
to sustain – to provide, to support
to adapt – to adjust, to change in new conditions
to recur – to happen regularly
to quantify – to calculate
to estimate – to determine quantity approximately
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