A price index is NOT Select one:
a. an inflation rate.
b. a way to track the prices for a group of products
c. a weighted average price of some type of good or service (e. g. consumer prices).
d. the cost of a specific basket of goods and services.

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:

well obviously you must be dumb if you dont noe dat