What are three features that make lake bailable on of the most unique lakes in the world

Baikal is also the world's most ancient freshwater lake, it originated 20-25 million years ago.

It is home to many unique species of animals and plants including the freshwater seal.

Lake Baikal is one of the clearest and purest bodies of water. In a good day you could see 40 meters into the lake.

letter a is the answer

d) post-world war i