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  • Biology Factsheet: 312. The importance of earthworms

    Biology Factsheet: 312. The importance of earthworms

    There are 27 species of earthworms in the UK but more than 3000 species worldwide. Some species live deep in the soil and never come to the surface; others spend considerable time moving between the s...

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  • Biology Factsheet: 313. Adaptations to water availability

    Biology Factsheet: 313. Adaptations to water availability

    Plants live in a wide range of habitats. The amount of water available varies with habitat and ranges from the permanent water of lakes and rivers to arid deserts. Different plants are adapted in diff...

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  • Biology Factsheet: 314. What is a species?

    Biology Factsheet: 314. What is a species?

    A species is the basic unit in the biological system of classification of living organisms. In this Factsheet we will: • give a working definition of a species • describe how species are na...

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  • Biology Factsheet: 315. Analyse, plan, answer

    Biology Factsheet: 315. Analyse, plan, answer

    A-level examinations and driving tests go together. If you are an A-level student then it is very likely that you will either be preparing for your driving test or have recently taken it. If you have,...

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  • Biology Factsheet: 316. Cofactors

    Biology Factsheet: 316. Cofactors

    Enzymes are proteins. Many enzymes, however, are associated with one or more metal ions or non-protein molecules that are essential for their function. These are cofactors. In this Factsheet we will:...

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  • Biology Factsheet: 317. Genotype, environment and phenotype

    Biology Factsheet: 317. Genotype, environment and phenotype

    One of the essential characteristics of living organisms is that they vary. In this Factsheet we will examine how: • the genotypes of organisms describe their genetic make-up in terms of the all...

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  • Biology Factsheet: 318. Measuring biodiversity

    Biology Factsheet: 318. Measuring biodiversity

    Biodiversity is a word that is commonly used in the popular media although its meaning is not always made clear. In this Factsheet we will explain: • the meaning of the word biodiversity. •...

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  • Biology Factsheet: 319. Measuring genetic diversity

    Biology Factsheet: 319. Measuring genetic diversity

    In Factsheet 318 - Measuring biodiversity, we looked at species diversity. Species diversity is only one aspect of biodiversity. Another very important aspect is the genetic diversity that exists with...

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  • Biology Factsheet: 320. Inorganic ions in living organisms

    Biology Factsheet: 320. Inorganic ions in living organisms

    This Factsheet describes the importance of the following inorganic ions in living organisms: • Hydrogen (H+) • Hydrogencarbonate (HCO3-) • Iron (Fe3+) • Sodium (Na+) • Phospha...

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  • Biology Factsheet: 321. Applied Exam questions on lipids

    Biology Factsheet: 321. Applied Exam questions on lipids

    There are many different types of lipid but in this Factsheet we will confine ourselves to two that you are likely to encounter on an A-level Biology course. We will look at: • saturated and uns...

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