Cells are the basic unit of structure in all living things. ... Since cells are in all living things, they provide information about all life. Because all cells come from other cells, scientists can study cells to learn about growth, reproduction, and all other functions that living things perform
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C. Develop new ways to test the hypothesis.
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The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
The information given is reliable because it is based on a number of studies which were done by scientists at a variety of veterinary schools. The studies are also recent according to the article. The differences between the American and English breed are clearly stated and precise making Devon's work of identification easy.