I have branches, but no fruit, no trunk and no leaves. What am I?

the government

Explanation:

because the government has branches, three of them, there is the legislative, the executive, and the judicial branch and the government doesn't have a trunk or fruit

i would say the correct answer is not concrete.

one thousand and one nights, also known as arabian nights is a collection of stories whose basic structure is that of embedded narrative. this technique refers to a main story which works as the common frame - or framing narrative - for the other stories, and then this series of stories which are connected to the main one. this technique can also be referred to as a story within a story. the stories stem from the original tale, some begin and end on their own, some are connected to the previous or following one, by means of questions that are answered in the subsequent tale, or characters which reappear.