Nkwakọ ngwaahịa na-agafe usoro sistemụ niile sitere na akụrụngwa, ị nweta, mmepụta, ahịa na ojiji, yana metụtara ndụ mmadụ. Site na mmejuputa atumatu nke nchedo gburugburu ebe obibi na mmelite nke ebumnuche nchedo gburugburu ebe obibi, nghoputa ...
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