When geologists use index fossils to match up rock layers, it is referred to as what?

i think the answer is gold im not entirely sure

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

the electromagnetic energy from the sun arrives in the form of visible and invisible light.