Consiste en organizar el intercambio voluntario y competitivo de manera que asegure un encuentro eficiente entre la oferta y la demanda de productos y servicios.

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.'

the correct option is c

turnover

the amount of money taken by a business in a particular period.

answer; (c) communism and socialism;