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Хөвчтөн — Википедиа нэвтэрхий толь
Загаснууд нь заламгайгаар амьсгалдаг, усан орчинд амьдардаг хүйтэн цуст амьтад юм. Яст загаснууд нь мөгөөрсөн араг яст загаснуудтай харьцуулахад дийлэнх олныг эзэлдэг. Яст загаснууд нь далайн гүнээс эхлээд гол мөрөн, нуур, тэр бүү хэл цөөрмийн орчинд ч амьдардаг. Зарим зүйлүүд нь цэнгэг болон давстай усны хооронд шилжиж байдаг. Эдгээр загаснуудын араг яс нь кальцийн фосфор хүчлийн давсаар бэхэжсэн байдгаараа тэнгисий…
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