sentence: Many animals use signs and sounds to communicate with each other.
sentences_after: But humans have a special system called language. It allows them to express ideas by using words. Humans are capable of making abstract ideas and communicating them to others. Human language can express things that are not present, or talk about events that are not happening at that time. The things might be elsewhere, and the events may also have occurred at another place or time.
concept_name: animal
headings: Human Important features
categories: Hominins