Economics: Does anyone know what the 25 marker was about in the 2019 paper 2 (macro) economics question paper?
There’s normally 2 options of 25 markers, what were them??

i believe it’s b because the rest don’t make sense

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.'

it is a i took the test.