Why the vitamin c, iron, vitamin D and calcium doesnt need to be digested before they are absorbed

They flow through the blood stream.

Explanation:

They are absorbed because your body consists of mainly water, many of the water - solute vitamins circulate easily in your body

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

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.