Protozoa (kingdom Protoctista) A phylum (division) of eukaryotic, single-celled micro-organisms which show a wide variety of forms. The phylum includes some plant-like forms and animal species that are free-living, commensal, mutualistic, and parasitic, and some important disease-causing organisms.
Lake Baikal in Siberia, Russia (Asia), is the world's deepest fresh water lake at 1,638 metres deep. It is 636 km long and is the world's sixth largest lake and 1,181 metr â¦ es of it is below sea level. It contains 20% of the world's fresh water which is so clear that divers suffer from vertigo.
Baikal lies in a deep structural hollow surrounded by mountains, some of which rise more than 6,600 feet (2,000 metres) above the lakeâs surface. The sedimentary strata on the floor of the lake may be as much as 20,000 feet (6,100 metres) thick. Breaks in Earthâs crust produce hot mineral springs in the area.