2021년 수능특강라이트 15강 3,4(기출+)

Lions, snakes, and eagles are examples of predators organisms that hunt and eat other organisms. Those that have the best techniques for obtaining food are the ones most likely to grow and reproduce. Predation affects the size of prey populations and the diversity of species within a community. One reason nonnative species are often a serious problem is a lack of natural predators in their new homes. Purple loosestrife is such a species, whereas in its native habitats its populations are kept in check by a leaf-eating beetle and root-eating weevil. Parasitism is a variety of predation; a parasite feeds on prey but often weakens rather than kills its host. Some parasites, such as wheat rust, have very specific host requirements. Others, such as mistletoe, parasitize a variety of species.

 

 

The saying goes that the ruined city of Petra in Jordan is 'the rose-red city, half as old as time itself'. This would mean it was built before the Earth was formed, so ignore it. But Petra is very old. Between about 200 BC and AD 400, it was the busy capital of the Arab kingdom of the Nabataeans. Hidden away among red sandstone hills and surrounded by cliffs, it was the perfect desert hideaway. Into the cliff faces, the people of Petra carved hundreds of exquisite temples, tombs and monuments. Many have spectacular facades (fronts) with carved columns and lintels, often in styles copied from the buildings of Greece and Rome. Most impressive of all is the front of the Treasury, which is 28 metres wide and 40 metres high.

 

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