In economics, capital refers to (a) goods, but not to services. (b) buildings and machines used in the production process.(c) the finances necessary for firms to produce their products.(d) the money households use to purchase firms' output.

In economics, capital refers to buildings and machines used in the production process.

The correct answer is B

Explanation:

In economics, capital is the totality of machines, tools, equipment and raw materials used in the production process.

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.'

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