What’s is the mode of inheritance of the graph

Which of the following is a common response to cell signaling?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

This is a biological reaction due to a stimulus. i need this quickly !