* Petroglyphs and hieroglyphs were early forms of communication. They were visual systems used to convey messages, stories, and ideas.
* They were not purely verbal communication. While they could represent some sounds and words, they were primarily symbolic systems that relied on visual imagery to convey meaning.
So, it's more accurate to say that petroglyphs and hieroglyphs were early forms of visual communication, often incorporating elements of language and storytelling.