Why is it important to use placebos and a double-blind approach in some studies

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

if i am correct, your answer choices are:

a. the temperature remains constant

b. the temperature increases at a constant rate

c. heat flows at a constant rate into the system

d. heat flows at a constant rate out of the system

e. no heat flows into or out of the system

if so, then the answer is e. no heat flows into or out of the system.