<em>1.)</em> <em>A lake can form when a river is blocked by mud and lava from a <u>volcano.</u>
2.) Algae can overgrow a lake when the lake contains too many <u>nutrients.</u>
3.) Nearly one third of the U.S. is covered by the Mississippi River <u>watershed.</u> <u /></em><u /> <em><u /></em><u />I hope this helped!! Have an amazing day :)<em>
septum is present between the two ventricles and separates the oxygenated and deoxygenated blood. hence if it gets ruptured then the two blood will mix up. thanks
