Shivering and sweating are two techniques that mammals use to a) adapt to the temperature
b) develop a rise in body temperature
C) maintain homeostasis
d) use excess energy

the answer is c) an oak tree

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 tricuspid valve is present between right atrium and right ventricle