The graph below shows the metabolic rates of two different organisms, X X\,X and YYY, across a range of ambient (environmental) temperatures.
Which of the following statements correctly explains the metabolic response of one of these organisms to maintain its internal environment?
At 10∘C10^\circ\text{C}10∘C, organism XXX reduces its metabolic rate by dilating its superficial skin arterioles to conserve heat in its core organs.
Within the 27∘C27^\circ\text{C}27∘C to 35∘C35^\circ\text{C}35∘C temperature range, organism YYY regulates its internal environment physiologically by dilating skin shunt vessels to prevent its core from overheating.
At 40∘C40^\circ\text{C}40∘C, organism XXX increases its metabolic rate to power active cooling mechanisms; physiologically, this is accompanied by the constriction of skin shunt vessels and dilation of superficial arterioles to maximise heat loss.
At 5∘C5^\circ\text{C}5∘C, organism YYY prevents its core temperature from dropping further by undergoing shivering thermogenesis and seeking shaded areas.