With regard to animals in general, some parts or organs are common to all, as has been said, and some are common only to particular genera; the parts, moreover, are identical with or different from one another on the lines already repeatedly laid down. For as a general rule all animals that are generically distinct have the majority of their parts or organs different in form or species; and some of them they have only analogically similar and diverse in kind or genus.
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观察鸡蛋的节选真的还挺有意思的，3天，10天，20天，小鸡就诞生了=。=
评分观察鸡蛋的节选真的还挺有意思的，3天，10天，20天，小鸡就诞生了=。=
评分观察鸡蛋的节选真的还挺有意思的，3天，10天，20天，小鸡就诞生了=。=
评分观察鸡蛋的节选真的还挺有意思的，3天，10天，20天，小鸡就诞生了=。=
评分观察鸡蛋的节选真的还挺有意思的，3天，10天，20天，小鸡就诞生了=。=
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