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A cost is composed of three elements – Material, Labour and Expenses. Each of these three elements can be direct and indirect, i.e., direct materials and indirect materials, direct labour and indirect labour, direct expenses and indirect expenses
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Earthworms (annelids) have slightly more evolved excretory structures called nephridia, illustrated in Figure 22.10b. A pair of nephridia is present on each segment of the earthworm. They are similar to flame cells in that they have a tubule with cilia. Excretion occurs through a pore called the nephridiopore.
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