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Essay from the year 2002 in the subject Biology - Ecology, grade: 1.1 (A), Oxford University (New College), 3 entries in the bibliography, language: English, abstract: Biological invasion happens when an organism, any sort of organism, arrives somewhere beyond its previous range. Nowadays, most invasions come from human actions, deliberate or accidental. But natural invasions happen too, from minor changes of range to major invasions across continents. One reason for studying invasions is that many invasive species have become serious pests. The cumulative losses in the USA from some...

Essay from the year 2002 in the subject Geography / Earth Science - Physical Geography, Geomorphology, Environmental Studies, grade: 1.1 (A), Oxford University (New College), 6 entries in the bibliography, language: English, abstract: Fertility is directly determined by so-called intermediate fertility variables or proximate determinants which are, in turn, affected by indirect determinants such as socio-economic, cultural and environmental variables. Many different proximate determinants influence fertility and the relationship between them and the level of fertility can be analysed using a...