Why would you use computer-aided design (cad) software?

a. to track each stage in the production cycle
b. to re-create the layout of a space before actually moving anything
c. to plan, track, manufacture, and deliver materials
d. to animate a person's actions when walking through a store

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.'

its kinda hard to answer this when we dont have all the information that we need.