What is the main ecological role of lakes in the environment?

YSL, You are confusing the question setters with intelligent. How many questions have you had asking to choose an option where only one option makes any sense at all . But to answer YOUR question: I don’t know of any wildlife that inhabits an active volcano.

YSL, also how can a lake form a volcano? or create currents in the ocean.....

Name one natural environment that is not habitat for wildlife. Dumb question.