. An increase in the cost of producing a good or service will cause a leftward shift of the supply curve. T/F

True.

Explanation:

The statement is true.

Cost of the factors of production is one of the main component of supply.

If there is an increase in the cost of production of a particular good then as a result the supply of that good decreases and this will shift the supply curve leftwards.

This is only because of the fall in the level of profits due to the higher cost of production. Therefore, the expensive factors of production induces firms to produce less.

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.'