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Purpose Making an ecosphere jar that includes producers, consumers, (and decomposers). Theory An ecosphere jar is a miniature ecosystem that does not need external resources. The plants (like algae) produce oxygen as a product of photosynthesis. Living animals (like snails, shrimps, or fish) breathe in oxygen and breathe out carbon dioxide and their waste contains nitrogen (both of which the plants need). The animals also eat algae and keep the

Question Prompt The 20th century has given us inventions that have changed our lives in many ways. Big inventions, like television, computers, or microwave ovens, have had such a great impact on our culture that they seem to overshadow the small ones, like ballpoint pens, headphones, or calculators Write an essay in which you argue whether the “big” inventions or the “small” ones play

内容简介 《围城》是我国著名文学家钱钟书先生所写的一部著名的长篇小说。 《围城》在中国的文学史上有十分重要的地位。 该小说主要描写了方鸿渐这样知识