A chemical or tool that indicates a substance is present is called a

all answers true and false

explanation:

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

c. the initial amount of money placed in the savings account