Please help me! :) 1) Question: How can we model changes in atmospheric carbon over time?
2) How does human activity affect the carbon cycle?

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. establishing proper sleep hygiene

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.