What do ecologists mean by the term succession? ?

Doing the text now can someone me

Mrs. walter’s husband died in 2016. she has not remarried and has maintained a home for herself and her dependent son, whom she can claim as a dependent. in the summer of 2018, the son was killed in an automobile accident. what is mrs. walter’s filing status for 2018

What caused the settlement of more african americans in the mississippi alluvial plain region then in the ozark mountains region?