Plant and animal cells. Cytoplasm. Jelly-like substance, where chemical reactions happen. In plant cells there's a thin lining, whereas in animal cells most of the cell is cytoplasm. Plant and animal cells. Nucleus. Controls what happens inside the cell.Carries genetic information. In exams don't call the nucleus the 'brain' of the cell.ytoplasm. Jelly-like substance, where chemical reactions happen. In plant cells there's a thin lining, whereas in animal cells most of the cell is cytoplasm. Plant and animal cells. Nucleus. Controls what happens inside the cell. Carries genetic information. In exams don't call the nucleus the 'brain' of the cell.
Iron is rarely found in its pure form on the surface of the earth; as it tends to get oxidized when it comes in contact with atmospheric oxygen. For this reason, most of its ores are in the form of iron oxides.
Iron is one of the elements you encounter in pure form. It is essential for nutrition and used in a variety of household objects. Here are some quick facts about iron. You can find detailed information about iron on the iron facts page.1  Iron is an element that has been known in its pure form for at least 5,000 years. 2  The name iron comes from the Anglo-Saxon word iron and Scandinavian iarn for the metal.ron is one of the elements you encounter in pure form. It is essential for nutrition and used in a variety of household objects. Here are some quick facts about iron. You can find detailed information about iron on the iron facts page.