Patent trolling is the process of. A. looking for loopholes in patent protection and exploiting them.
B. recording and registering patents in foreign countries to protect the firm's IP.
C. searching out patents that have expired and negotiating their replacements.
D. legal research that uncovers obscure, deceased patent holders and liberates their inventions.
E. none of the above.

The correct answer is letter "A": looking for loopholes in patent protection and exploiting them.

Explanation:

Patent trolling is the act by which a company looks for structural issues in the patent and court systems so the firm files court cases to earn revenue. There is no need from the filing company to be engaged in the development of an item related to the patent claimed as vague.  

Patent trolling is not considered an illegal activity in the U.S.

there is no following so id just amuse false

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.'