During the process of ecological succession

answer; ///(b) it is composed of four protein chains and four heme groups;

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

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.