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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. 2. How aggressive they may be Those that support animal testing claim that is a necessary practice. They explain that businesses that rely on animal testing do use humane ways to feed, house and care for the animals. Supporters also claim that alternatives to animal testing aren't as far reaching, lacking the opportunity to figure out how cosmetic products affect living tissue and organs.