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.
And only on Lake Baikal gas hydrates were found at a shallow depth and in a freshwater reservoir. 7. Lake Baikal is the oldest lake in the world; it is about 35 million years old (according to other sources â 25 million years old). Usually freshwater lakes quickly get âovergrownâ with silt, sometimes even in a matter of a few decades â and thus disappear.