Elije un arma de la primera guerra mundial y explicala a fondo .

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

a woodchuck would chuck 12.5 wood : 3

an early twentieth-century ad for model home blueprints