According to the text, judge the item from.The last period o...
The last period of the text is in the present perfect tense in which “been” is the past participle of the verb to be.
The present perfect tense is used in this sentence because it is referring to an action that started in the past (the invention of farming) and continues to be important in the present. The verb "been" indicates that the importance of agronomy has continued up to the present moment.
O presente perfeito é usado nesta frase porque se refere a uma ação que começou no passado (a invenção da agricultura) e continua a ser importante no presente. O verbo “estar” indica que a importância da agronomia continua até o presente momento.