Usually a company is classified as a single business firm when revenues generated by the dominant business are greater than percent

A company is classified as simple business when revenues generated by the dominant business are greater than 95%.

Explanation: The advantage of having a company where its profits come from a single type of activity, is that they concentrate all their forces and can have a better competitive advantage than in the opposite case, activities are diversified. Example: A company dedicated to the manufacture of private vehicles would be simple if it only executes the manufacture of vehicles and diversified when it sells in addition to private vehicles, trucks and motorcycles.

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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