Remain true to yourself, but move ever upward toward greater consciousness and greater love! at the summit you will find yourselves united with all those who, from every direction, have made the same ascent. for everything that rises must converge.”

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

answer; communities of interest; i believe this is correct, plz check first good luck;