Hattie and her family are fleeing their home due to rising floodwaters. they are in a state of panic, which means that the sympathetic division of hattie's autonomic nervous system has been mobilized for

I don't know what options you have but in a situation of panic like this one, the sympathetic division of the nervous system is dominant. The sympathetic division prepares the body for this situation in two possible ways to ensure survival: fight our flight. There will be increased blood to vital organs( adrenaline oxygen circulation), blood clotting (minimizes loss of blood if wounded), peripheral vision (improves vision), etc to make a better response.
The answer is probably: dominance

Nucleus is the organelle that contains chromosomes