Awriter does not need to cite something as long as it is

What point is the author most likely making with the example september 11

In concrete mixers what seems to be the speakers feeling about the concrete mixers

For this assignment, you will create a multimedia presentation in response to the following prompt: research suggests that laughter improves people’s emotional and physical well-being. create a multimedia presentation to inform the audience about the positive effects of laughter on emotional and physical health.