'm going to say <span>clear cutting </span>because clear cutting reduces a ecosystem/population of species that has been there for a while or long while. With secondary succession it is a process that is triggered by an event such as clear cutting or natural disasters.
Hopefully this helped and good luck.
A human somatic cell usually contains twenty-three pairs of chromosomes. Only one of these pairs will be a pair of sex chromosomes. The genetic composition of a male child is twenty-two pairs of autosomes- any chromosome that is not involved in sex determination - and one pair of sex chromosome (XY). This can be represented as 22-XY.
If it is the Spring Equinox in the northern hemisphere, the condition would be A. Cool temperature.