B) receptor, integrating (control), effector organ
Explanation:
Homeostasis is tendency of an organism to maintain stable internal environment by responding to internal and external changes. It involves positive and negative feedback systems. Three main components of the homeostatic control system are:
sensors (receptors) which detect the change and send information to the next component, center
control center (usually in brain) which receives the signal process it and activate the next component, efffector
effectors (usually muscles and glands) which respond to stimuli (the change).
"<span>Covered with an enormous sheet of ice" would most likely match Europe, although it should be noted that this was a while ago and changes with time. </span>
