List the helpful interactions.
List the harmful interactions.

b would be the right answer

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d