"Communication styles are express in a competitive enviornment."

I need to identify the error in this sentence and correct the sentence. Thank you

(teacher mode)
Ok, read the sentence to yourself. Don't think about it as you read it, just read it and listen to how you say it. Something is missing and if you do this, you SHOULD find it.
If you don't find it the first time, read it out loud again. More if needed.

Good luck