Scanning electron micrograph (SEM) of cancellous (spongy) bone of the human shin. Bone tissue is either compact or cancellous. Compact bone usually makes up the exterior of the bone, while cancellous bone is found in the interior. Cancellous bone is characterised by a honeycomb arrangement of trabeculae. These structures help to provide support and strength. The spaces within this tissue normally contain bone marrow, a blood forming substance. Credit: SCIENCE SOURCE/SCIENCE PHOTO LIBRARY

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Standard Laurus nobilis (Bay) trees, Convolvulus cneorum (Morning Glory) and Petunias. Walls covered by a white flowering Trachelospermum jasminoides (Star jamsine). Borgo Santo Pietro, Siena, Tuscany, Italy © Andrea Jones/Garden Exposures Photo Library.

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Art of Diatom algae (from Ernst Haeckel) B305/0177 Rights Managed Credit: MEHAU KULYK/SCIENCE PHOTO LIBRARY

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Marbled tree frog (Hyla marmorata), camouflaged against lichen-covered bark. Credit: Gregory Dimijian/ Science Photo Library

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Pictographs in The Great Gallery, Canyonlands National Park, Utah USA. Credit: KEITH KENT/SCIENCE PHOTO LIBRARY

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