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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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  • Biology Factsheet: 266. Bad clots: deep vein thrombosis

    Biology Factsheet: 266. Bad clots: deep vein thrombosis

    Deep vein thrombosis (DVT) is a blood clot that has formed in oneof the body’s deep veins e.g. in the calf or thigh muscle of the legs.This causes pain and swelling but if part of the clot break...

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  • Biology Factsheet: 267. How Science Works: Investigating probiotics

    Biology Factsheet: 267. How Science Works: Investigating probiotics

    This Factsheet:• Summarises the roles of the trillions of bacteria that live• Describes the potential benefits of probiotics• Reviews recent investigations into whether probiotic supple...

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  • Biology Factsheet: 268. The Biology of skin cancer

    Biology Factsheet: 268. The Biology of skin cancer

    This Factsheet:• Describes the causes and characteristics of malignant melanomas• Describes the most common type of exam questions on this topic• Outlines the most common errors and mis...

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  • Biology Factsheet: 269. Eradicating mosquitoes via GM

    Biology Factsheet: 269. Eradicating mosquitoes via GM

    This Factsheet:• Explains how scientists have created self-destructing and flightless GM mosquitoes• Discusses the possible wider ecological effects and ethical issues of GM mosquitoes...

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