Is primary succession or secondary succession occurring in the picture above?

When does dna replication(make a copy of itself)?

Match each term to its best definition? sedimentary depositional enviornment

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