What is on the back of the 50 dollar bill?

the capital of the united states

Explanation:

this is what is located on the back of the $50 bill

the page presents four different kinds of threats that volcanoes pose and what to do before, during, and after an eruption.

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.'