Davis Corporation manufactures and sells portable radios. The radio sells for $ 50.00 per unit and its variable costs per unit are $ 30.00. Fixed costs are $ 57 comma 000 per month for sales volumes up to 25 comma 000 radios. If more than 25 comma 000 radios are sold, the fixed costs will be $ 42 comma 000. The flexible budget would reflect what monthly operating income for a sales volume of 42 comma 000 radios?

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.'

they work in some type of way