III. The following text contains 15 mistakes. Spot and correct them

The study of groups of organisms, called Synecology, is largely descriptive and not easily quantified and contain a bewildering array of terminology. Only recently, since the advent of the electronic and atomic ages, did synecology developed the tools to study complex systems and entering an experimental phase. Important concepts developed by synecology are those concerned of nutrient cycling, energy budgets, and ecosystem development. Synecology has strong ties with pedology, geology, meteorology, and cultural anthropology.

Synecology may been subdivided according with environmental types, as terrestrial or aquatic. Terrestrial ecology, which may be farther subdivided into forest, grassland, arctic, and desert ecology, concerns such an aspects of terrestrial ecosystems as microclimate, soil chemistry, soil fauna, hydrologic cycles, ecogenetics, and productivity. Terrestrial ecosystems are more influencing by organisms and subject too much wider environmental fluctuations then are aquatic ecosystems. Aquatic ecosystems are affected more by the condition of the water and resist such environmental variables as temperature. Because the physical environment is such important in controlling aquatic ecosystems, considerable attention is paid on the chemical and physical characteristics of the ecosystem, such as the currents and the chemical composition of the water. By convention, aquatic ecology, called limnology, is limit to freshwater stream ecology and lake ecology. The former concerns life in flowing waters; the later, life in relatively still water. Marine ecology deals with life in the open sea and in estuaries.

LISTENING COMPREHENSION

I. You will hear a text about the development of ecological systems. Before listening discuss the words in the box with your fellow students and your teacher

sterile area barren rock lava flow disrupted ecosystem climax ecosystem fertilization inbreeding of crops arable lands fossil fuels recycling techniques

interference in the development of ecosystems deliberate maintenance of an immature ecosystem Sound management of ecosystems hinder efficient energy use heightened susceptibility to plant diseases optimal long-term production of pasturage a moderate grazing schedule renewal of the moisture and nutrient content of the soil accumulated insecticides

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II. Paraphrase each sentence using the word in bold type	\|	II. Listen again. Choose the right option to complete the following sentences. In some cases more than one option is possible

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