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The two claws of the lobster (Homarus americanus) are identical in the juvenile stages. By adulthood the claws have differentiated into a "crusher' and a "cutter". In a study of the differentiation process, 26 juvenile animals were reared in smooth plastic trays, 18 were reared in trays containing several oyster chips, and 23 were reared in trays with only one oyster chip. The claw configurations are given in the table. We want to know whether claw configuration is dependent on the type of tray in which the lobsters were reared.
Claw configuration
Right crusher, left cutter right cutter, left crusher right cutter, left cutter
Tray type
Oyster chips 8 9 1
Smooth plastic 2 4 20
Single chip 7 9 7
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