Parents have many responsibilities to their children, these responsibility must be taken seriously in order to keep the children in the right path. The parental responsibility that I will personally found very interesting is teaching my children how to do different stuffs. Like teaching them cook different dishes and cookies or teaching them to play different games or teaching them funny tricks in mathematics.
Although the DNA packaging with histones proteins is mean to form nucleosomes (groups of 8 histones proteins), the higher structures why the genetic material is packaged with those molecules is to form chromosomes, as you said.
About 3 to 5 days I hope that helped lol
The second on :” the number of valence electrons stays the same” because a valence electron is the number of electrons on the outer shell of the atom and if it’s in group one then the outer shell of any element will have one electron on its outer shell
The force of attraction between two objects is gravity (gravitational pull) so I believe that the answer is (b. universal gravitation).