Which of the following is true with regard to nafta?

a. today mexico, canada, argentina, brazil, and the united states are party to this agreement.
b. nafta has increased trade between canada, mexico, and the united states.
c. it is largely seen to be the reason behind reduced labor productivity in mexico.
d. the galã¡pagos declaration effectively launched the nafta and the provisions of contents of the nafta.
e. on average, studies indicate that naftaâs overall impact has been extremely large, but negative.

The correct answer is choice b.

Explanation: NAFTA is the trade agreement between Mexico, United States and Canada with the purpose to expand trade between the three countries. Its secondary purpose was to make these countries more competitive in the global marketplace. The agreement has been successful in achieving both goals and NAFTA is now the largest free trade agreement in the world.

the answer is i don't know

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.'