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.
It is used a lot because it is very strong and cheap. Iron is the main ingredient used to make steel. Raw iron is attracted to magnets, but it is not actually a magnet, however it can be used to make an electromagnet.t is used a lot because it is very strong and cheap. Iron is the main ingredient used to make steel. Raw iron is attracted to magnets, but it is not actually a magnet, however it can be used to make an electromagnet.