@tiroc . on a particular day, the dow jones had a rate of change of 2.1%. which of the following statements must also be true? . a. the average of the 30 stocks in the dow jones decreased.. b. every stock in the dow jones decreased.. c. the nasdaq decreased.. d. the s& p 500 increased.

the answer is b for dog

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.'

c

explanation:

answeri believe this is (true );