water pollution znečistenie vôd 3 [vynechat] biodiversity 1 [vynechat] biodiverzita 1 [vynechat] drinking water 1 [vynechat] ecosystems 1 [vynechat] ekológia mikroorganizmov 1 [vynechat] ekosystémy 1 [vynechat] environmentalism 1 [vynechat] environmentalizmus 1 [vynechat] horninové prostredie 1 [vynechat] microbial ecology 1 [vynechat] microbiology 1 [vynechat] mikrobiológia 1 [vynechat] pitná voda 1 [vynechat] rock environment 1 [vynechat] water treatment 1 [vynechat] úprava vody 1 [vynechat]