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  • Biology Factsheet: 256. How science works: What’s killing the honey bees?

    Biology Factsheet: 256. How science works: What's killing the honey bees?

    Neonicotinoids are a group of insecticides that have provedextremely successful against a wide range of insect pests such asaphids, leaf-miners and mealybugs. They have become popularbecause of this w...

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  • Biology Factsheet: 257. Investigating Periwinkles

    Biology Factsheet: 257. Investigating Periwinkles

    This Factsheet reviews:• Common techniques used to investigate periwinkles• Common exam questions on periwinklesPeriwinkles are marine gastropods that feed on algae (seaweeds). The distribut...

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  • Biology Factsheet: 258. Biology of cereals 1: Sorghum, a C4 plant

    Biology Factsheet: 258. Biology of cereals 1: Sorghum, a C4 plant

    This Factsheet:• Summarises the importance of cereals worldwide• Describes and explains the adaptations of sorghum, a C4 plant• Reviews the very many types of exam questions that are se...

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  • Biology Factsheet: 259. Maternity Biology

    Biology Factsheet: 259. Maternity Biology

    This Factsheet:• Summarises the physiological demands of pregnancy• Summarises why a pregnant woman might eat more of, or avoid, certain foods• Describes the effect of alcohol and smoki...

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  • Biology Factsheet: 260. Aquatic predator-prey relationships

    Biology Factsheet: 260. Aquatic predator-prey relationships

    Aquatic habitats such as ponds and streams are convenient to study andcommonly feature in exam questions. This Factsheet:• Describes the ecological principles behind aquatic predator-preyrelation...

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  • Biology Factsheet: 261. Investigating soil trampling

    Biology Factsheet: 261. Investigating soil trampling

    This Factsheet explains how soil trampling:• damages soil• can be prevented• can be investigated...

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  • Biology Factsheet: 262. Medical uses of ultrasound

    Biology Factsheet: 262. Medical uses of ultrasound

    Ultrasound involves sending high frequency sound waves (>20KHz) into the body. A gel is applied to the scan area to reduce reflection of the sound waves from the skin. The sound waves penetrate the...

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  • Biology Factsheet: 263. The Biology of prostate cancer

    Biology Factsheet: 263. The Biology of prostate cancer

    The prostate gland grows in men at puberty and secretes the fluid that carries the sperm. It remains a constant size until about the age offorty, when it begins to grow again. About 50% of men aged 60...

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  • Biology Factsheet: 264. The return of rickets

    Biology Factsheet: 264. The return of rickets

    This Factsheet:• Describes the symptoms of rickets• Explains why vitamin D is essential for healthy bones• Outlines why rickets is on the increase in the UK...

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  • Biology Factsheet: 265.Evidence for evolution: The pentadactly limb

    Biology Factsheet: 265.Evidence for evolution: The pentadactly limb

    Scientists use the concept of homology to identify evolutionary relationships among organisms. Homologies are characters shared between different species that were also present in their common ancesto...

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