I. Answer the following questions

· Is there any relation between the multitude of species inhabiting our planet?

· What is the reason for the great diversity of living beings on the earth?

· What do you know about the theory of evolution?

II. Listen to the following words and practice their pronunciation

Descent, gene migration, gene recombination, genetic drift, genotype, heterogeneity, interbreed, larkspur, lineage, saline.

READING COMPREHENSION AND VOCABULARYDEVELOPMENT

I. Match each word on the left to its correct definition on the right

1) accumulate, v 2) affect, v 3) affinity, n 4) bias, n 5) descent, n 6) disintegrate, v 7) estimate, n 8) heterogeneity, n 9) lineage, n 10) preservation, n 11) propinquity, n 12) spontaneous, adj 13) transmit, v

a) a rough or approximate calculation; b) the quality of something that consists of dissimilar or diverse ingredients or constituents; c) derivation from an ancestor; d) a group of individuals tracing descent from a common ancestor; e) to produce a material influence upon or alteration in; f) arising from a momentary impulse; g) to convey by inheritance or heredity; h) tendency, inclination or predisposition; i) to increase gradually in quantity or number; j) to lose unity by or as if by breaking into parts; k) the act of keeping safe from injury, harm, or destruction; protection; l) nearness of blood; kinship; m) a relation between biological groups involving resemblance in structural plan and indicating a common origin.

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III. Choose the right option to complete the sentences below	\|	II. Read the following text paying attention to the highlighted words. Explain or interpret the contextual meaning of the underlined phrases

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