Common ancestry and evolution?

there many signs point common ancestry, argued logical blueprints. example, there 2 chair makers, 1 in , 1 in africa. both make same type of chair 4 legs , because works, not because had "common ancestor".
how argue against support evolution?

there many signs point common ancestry, argued logical blueprints. example, there 2 chair makers, 1 in , 1 in africa. both make same type of chair 4 legs , because works, not because had "common ancestor". how do...

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