Although the world economy is much more integrated today than was the case 10 or 20 years ago, a variety of barriers still hamper free movements of people, goods, services, and capital across national boundaries. these barriers include:
select one:
a. legal restrictions.
b. excessive transportation costs.
c. information asymmetry.
d. all of the above.

The correct answer is d. All of the above.

Explanation:

Barriers to entering a market are obstacles of various types that complicate or hinder the entry into a market of new companies, brands or products. There may be barriers of an economic, legal nature or even related to areas such as ethics or public image.

The barriers to entry are usually related to different important points such as the size of the sector in which to enter, its main distribution channels or the necessary preparation for the participating personnel and that it is necessary to hire.

i think it is sales-oriented, but i am not sure

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.'