En los animales, el sistema circulatorio no es complemento del respiratorio ya que el intercambio de gases se realiza independientemente del transporte de sustancias. ¿Qué características tiene el sistema circulatorio de los organismos que presentan esta particularidad?

the correct answer is c   with the systems

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.