Cretaceous nthawi
Birch golide wamano choko sichizizira ndipo chapamwamba, kwambiri kulawa kwamakumwa pakamwa kotseguka kumatha - komwe timafuna. Burashi yothina imakanikizidwa mwachidule mu choko choyera ndipo ikapindika, imasanduka yobiriwira maolivi. Kusintha kwa mankhwala ochiritsira mano kupita ku choko cha mano kungatenge nthawi. Kumverera pambuyo poyeretsa kumakhala kwatsopano, kwachilengedwe komanso kutitsimikizira.
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