Alice lived with her parents in F-2 immigration status in the United States from August 2010 to June 2012. She returned to the U. S. to attend college in F-1 immigration status on May 1, 2019. Alice does not need to file Form 8843 for 2020. A. True
B. False

B. False

Explanation:

According to the rules guiding the F-1 visa holders, all "non-residents for tax purposes are required to file Form 8843."

So Alice entering into the U.s with F-1 status implies that she'll be treated as a "non-resident", therefore she would need to file Form 8843 for 2020.

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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.'