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This work indicates the importance of mathematical modelling, which results in the adoption of mathematical concepts through development of problem-solving abilities and logical-mathematical thinking. Teaching methodology literature perceives mathematical modelling as a frame for learning mathematics within which other sciences and scopes of life are studied through mathematical contents. For preschool children, it is the world they live in, where each new situation represents a real natural problem. Mathematical modelling is another social experience and novelty in their lives. At an early age, modelling is a revealing activity that entails mathematisation of a real situation and creation of a model. This enables children to focus their attention on different types of presentation of the variable relations. This paper presents the research of preschool teachers' attitudes about values of mathematical modelling, its appropriateness for early childhood, and possible application in preschool mathematics learning. By using the questionnaire on the sample of 197 subjects, the obtained results confirm preschool teachers' positive attitude towards modelling, but also the insufficient knowledge about theoretical and practical trends related to this topic.

The paper examines the empirically verified effect (parallel group experiment) of the application of the software form of integration and individualization of teaching of natural and mathematical knowledge in relation to traditional teaching, for example, the teaching sub-themes Cultivated habitats and life communities, and Equations with addition, subtraction, multiplication and division in the set N (the natural numbers) and N0 (the natural numbers plus the neutral element 0). The sample consisted of 250 pupils aged 10 to 11 years: 125 in the experimental group and 125 in the control group. The data were processed by statistical procedures and displayed in textual and graphical ways. The statistical analysis of the data obtained from the research has been achieved by the SPSS 17.0 software package, wherein the arithmetic mean, standard deviation, a t-test. Statistical indicators have confirmed the assumptions that the software form of integration and individualization contributes to more efficient and easier acquiring of knowledge, raising the quality and quantity of students' knowledge and increasing the interest in studying content in the teaching of Knowledge of Nature and Mathematics, and as such points to a preferred model of teaching and learning.

According to data given by [1], 165 spider species from 27 families and 103 genera are known in the territory of Bosnia and Herzegovina. So far in B&H, according to [1] a total of 11 species have been registered from Fam.Aranidae and 2 species from genus Araneus; a total of 11 species from Fam.Thomisidae; a total of 11 species from Fam.Lycosidae and one species from genus Lycosa; 15 species from Fam.Theridiidae and 3 species from genus Steatoda. In the course of our research on arachnofauna in and around Gromiţelj, in the 2008-2015 period, a total of 8 spider species new to Bosnia and Herzegovina were discovered in four families, namely, from Fam. Aranidae 4 species; Fam.Thomisidae 2 species; and 1 species each from Fam.Lycosidae and Fam. Theridiidae each. Most widespread are Argiope bruennichi and Araneus angulatus that were registered in 20 sites, followed by Araneus quadratus, Synema globosum and Runcinia grammica registered in 6 sites. Sites with the most registered newly discovered species are Gromiţelj with 6 species, followed by Velino selo, Laketića vir, Prugnjaĉa, Begov put and other melioration channels with 5 species. By biotope types, the greatest number of species, six of them, were found in vegetation (wetlands, thicket, forest fringe and vegetation on the channel banks and along the roads). The species Argiope bruennichi and Araneus angulatus also showed the greatest diversity of habitats, from wet meadows, thicket and reeds around the wetland, through forest fringes and vegetation along the channel banks and roads, to those urban like yards with ornamental shrubs. Of the registered species, only the species from Fam.Thomisidae are completely harmless to humans, while the other species belong to slightly poisonous species and have a local character bite. Slightly poisonous species include the species of the genus Steatoda, Araneus, Argiope and Lycosa.

Parallel with the research of Bacillariophyta flora in the well with shadoof on the area of Semberija was researched Bacillariophyta flora of other freshwater systems that are located in the near or distant environment from the researched wells, such as Drenovaĉa swamp, Sava river, Jelaz canal, artesian wells and ephemeral swamps. It is very interesting to compare Bacillariophyta flora that inhabits wells and Bacillariophyta flora of Drenovaĉa swamp that is only a dozen meters away from the researched well of Lazić Mijo, a local in the village Velino Selo.All identified Bacillariophyta in researched well belong to aerophile, which indicates on certain ecology of the well, that is a specific life conditions that are present in wells as anthropogenic creations. Contrary to the well flora, Bacillariophyta flora of Drenovaĉa swamp is composed party of algae belonging to benthos. In Lazić Mijo well were identified 33Bacillariophyta, all aerophile, while in Drenovaĉa swamp were identified 57 Bacillariophyta, from which only 18 are aerophile and others belong to benthos.Considering that Bacillariophyta is a component of aeroplankton, and that via air currents can be transmitted over long distances, it is assumed that similarly aerophile Bacillariophyta were transmitted on mosses associations on the well wall, manifested their adaptive attributes in such biotopes, and by that became autochthonous flora of the well. Large qualitative differences in Bacillariophyta flora in wells with shadoof and in Bacillariophyta flora of Drenovaĉa swamp also indicate on autochthony of Bacillariophyta flora of the well, which means that species were not transmitted from the neighborhood.