Lantsetnikning asosan qaysi begilariga ko’ra umurtqali hayvonlar gruppasiga kiritilganligini belgilang?
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jabra yoriqllari, tana bo’shlig’i
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qon aylanish sistemasi, nerv sistemasi
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xorda, nerv sistemasi
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ayirish sistemasi, ovqat hazm qilish sistemasi
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jabra yoriqlari, ayrihs sistemasi
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