2/. complete the sentences. use verbs in the present perfect simple with signal words ! ?

lapland state biosphere reserve  the area of the protected territory -278 435 ha. area buffer zone -27 998 ha.the richness of biological diversity of the reserve due to the geographical, landscape and climatic conditions. old-growth forests, the age of which ranges from 3000 to 9000 years, is represented by scots pine (pinus sylvestris ssp. laponika) and spruce (picea obovata), and the fauna consists of arctic, siberian and european species. currently on the reserve concentrated on scandinavia's largest herd of wild reindeer numbering more than 1,000 animals.the first zoological study to date of the reserve were held in the late 19th and botanical to early 20th centuries. systematic observation of phenomena and processes in nature began with 1930, the date of the organization of the reserve. since then all information on the characteristic of ecosystems is recorded in the "chronicles of nature", reports, monographs, scientific publications. the number of test areas and hospitals of the research conducted since the organization of the reserve.