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  • Biology Factsheet: 119. Biogas

    Biology Factsheet: 119. Biogas

    Fossil fuels are finite – at some point coal, oil and gas will become too expensive to use for all but the most essential functions. The search for alternative, sustainable sources of energy has...

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  • Biology Factsheet: 120. The Chi-Squared Test for Association

    Biology Factsheet: 120. The Chi-Squared Test for Association

    The chi-squared test for association (or association index or chi-squared contingency tables) is commonly used in projects to measure whether two factors are associated (e.g. whether greater numbers o...

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  • Biology Factsheet: 121. Artificial Cloning Techniques

    Biology Factsheet: 121. Artificial Cloning Techniques

    This Factsheet describes:  • modern techniques of cloning animals and animal tissues;  • modern techniques of cloning plants and plant tissues;  • applications of arti...

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  • Biology Factsheet: 122. Answering Exam Questions on Statistics

    Biology Factsheet: 122. Answering Exam Questions on Statistics

    Examination questions may require the calculation and interpretation of statistical measures and tests. This Factsheet discusses strategies for approaching such questions and gives guidance on common ...

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  • Biology Factsheet: 123. Innate Behaviour

    Biology Factsheet: 123. Innate Behaviour

      This Factsheet describes:  • differences between innate and learned behaviour;  • taxes and kineses as examples of innate behaviour;  • reflex actions such as ...

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  • Biology Factsheet: 124. Saprobiontic and parasitic modes of life

    Biology Factsheet: 124. Saprobiontic and parasitic modes of life

    This Factsheet describes:  • saprobiontic and parasitic modes of nutrition, illustrated by the nutrition of Rhizopus and Taenia;  • the roles of saprobionts in the nitrogen and c...

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  • Biology Factsheet: 125. Harvesting From a Natural Ecosystem - Fisheries

    Biology Factsheet: 125. Harvesting From a Natural Ecosystem - Fisheries

    Fish stocks are increased in two ways:  1. Birth of fish  2. Growth of fishFish stocks are decreased in two ways: Fish stocks are decreased in two ways: 1. Death of fish by natural means...

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  • Biology Factsheet: 126. Natural vs Agricultural Ecosystems

    Biology Factsheet: 126. Natural vs Agricultural Ecosystems

    Our early ancestors were hunter-gatherers. Rather than attempt to grow their food in a particular place and organise their settlement at that place, they wandered, killing wild animals and collecting ...

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  • Biology Factsheet: 127. Analysing Studentsí Wrong Answers1: Ecology

    Biology Factsheet: 127. Analysing Students' Wrong Answers1: Ecology

    This Factsheet analyses students’ real answers to exam questions. Some of the students received an A grade, some received an E. We’ll look at how these two groups tackled the ecology quest...

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  • Biology Factsheet: 128. Active Transport in Humans

    Biology Factsheet: 128. Active Transport in Humans

    Active transport is the movement of molecules or ions across a differentially permeable membrane up a concentration or electrochemical gradient. Active transport is not passive, it requires ATP. In fa...

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