Zvichakadaro vanhu vazhinji vanonakirwa nekunwa tii inotsemurwa nechirimo nemukaka kunyangwe mushure mekubikwa nemvura nyoro. Icho chikonzero nei vanhu vakasununguka kunwa tii nemukaka chine chekuita neiyo calcium iri mumukaka. Nekudaro, mukaka ukawedzerwa, muviri unovandudzwa uye zvichikonzera tii ine kuravira kwakapfuma.

kofi purinda muchina mutengo