Question

correct the text by inserting a comma or commas.
wow elephants are incredibly intelligent: they use a complex system of communication that includes a variety of sounds and body language.

Explanation:

The interjection "Wow" at the start of the sentence needs a comma after it to separate it from the main independent clause, as interjections are set off from the rest of the sentence with punctuation for proper grammatical structure.

Answer:

Wow, elephants are incredibly intelligent: they use a complex system of communication that includes a variety of sounds and body language.