tailieunhanh - bbc wildlife magazine 2010 phần 6

Tham khảo tài liệu 'bbc wildlife magazine 2010 phần 6', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | HONEYBEE Ị POLLEN SAC I The hind legs of honeybees and their relatives such as bumblebees have a flat polished area surrounded by spiky hairs for carrying pollen efficiently. Called a pollen sac or corbicula it is the insect equivalent of a shopping bag and without it many crops would go unpollinated. LATEX We have harvested latex from the Hevea brasiliensis tree since prehistoric times. It can be treated by smoke to create rubber a material that literally makes the modern world go round. In 1876 rubber tree seeds were smuggled out of Brazil to establish rival plantations in south-east Asia -an early example of biotheft. BIRD S WING 57CUPQLTEA. Tea is an infusion made from the dried and powdered young leaves of Camellia sinensis. This shrub grows where annual rainfall exceeds 75cm often at relatively high altitudes in the tropics. In a natural state it will form small trees but it is normally pruned to help with the harvesting of the leaves and branch tips. Tea drinking was considered to be beneficial to health but also became a social activity and from about 1800 it formed the basis of a major trade between India and Britain. Enormous areas here and in other parts of the British empire were given over to tea cultivation creating a distinctive landscape largely devoid of wildlife. 50. M Bowler natureplcom 54. We Shoot Alamy 57. Mary Evans Alamy. 58. s D Miller 59 62 Dorling Kindersley. 60. c Keyes Alamy. era 2 Alamy 66. K WheaựAI In cross-section a bird s wing has curved surfaces so that air flows faster over the top than under the bottom creating lift. This design known as an aerofoil has never been bettered and it continues to keep our aircraft in the skies. DROMEDARY HOOF The broad hooves of camels enable them to walk on soft sand where horses and vehicles cannot go. These hardy if bad-tempered mammals made it possible for US to explore the world s deserts. SHARK TOOTH Sharks have no bones v only cartilage but their teeth are among the .