Who developed his theory of evolution by natural selection based largely on observations he made on the Gallapagos islands

"d.) carbon dioxide and hydrogen sulfide"

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