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Shampoo, lotion, toner, face cream and fluoride toothpaste - just a few of the many products which we use daily, and which may have been tested on animals. Thousands of services flood the cosmetics aisle every year. For most of these products, animal testing was used at some point in its research and development. Though animal testing in research and drug development still remains common practice, even scientists now agree that alternatives to animal testing can and may help the non-public care and cosmetics industry. Wondering the other ways exist to test products as opposed to animal testing? Alternative methods have been cheaper, safer and supply faster results. In early embryonic development, an oversight can take place giving the embryo some cells with two X chromosomes and several with three X chromosomes. Luckily, both types of cells continues to divide and since not every cells have the abnormal amount of X chromosomes the female is only going to experience mild, if any, symptoms. When tractors were first developed, they used enormous steam engines which were notoriously unreliable and challenging to maintain. These were phased out round the turn in the 20th century and substituted with internal combustion engines that have been more compact yet still powerful and ran on the variety of fuels including kerosene, ethanol and gasoline. By the 1960s many of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel.