An advantage of the method of organism classification is that the system is hierarchical and implies relatedness in organisms grouped together in a genus.

the answer is a) cell division.

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essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.