The replication of chromosomes by eukaryotes occurs in a relatively short period of time because each chromosome contains multiple replicons. Prokaryotic such as bacteria often contain only one chromosome with one origin at which two replication forks assemble and move in opposite directions.
A courtship dance or mating ritual hope this helped
I think it is change to the phenotype of the organism
You're either talking about Community which means grouping of different organs or population which is the grouping of the same organ