Positive feedback helps increase effectiveness no plagiarism please other then that just answer the question not too long and not too short.this is the que

Positive feedback helps increase effectiveness no plagiarism please other then that just answer the question not too long and not too short.this is the questions:1.Explain the following statement using an example:Positive feedback helps increase effectiveness of negative feedback loops.2.What is the unique property of phospholipids that make them a suitable molecule for a plasma membrane?