Hablar y escribir son las dos actividades básicas de la

Answer: Human comunication / Comuncación humana.

Explanation:

This can be translated to:

"Talking and writing are two basic activities of ... "

To complete this sentence we should use "communication" or "human communication".

in order to be able to talk or write something, we must have a language, which is not only the keystone of human communication, is also a keystone in the human evolution.