El crimen casi perfecto. 1) ¿cual fue el dato mas importante para poder resolver el caso??

2) ¿como llega el narrador a obtener esa información tan significativa para saber que ocurrió?
me ayudan por favor ​

what are your answer choices?

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

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex