When you are finished presenting your information for your Discovery Quest, you need to somehow let the audience know that you're finished. This should be done smoothly and in a way that goes with the rest of your speech.
Here are a couple of examples of how you can conclude your speech:
Give some advice...
"So the next time you are swimming in the ocean, try not to worry about encountering a shark!"
Reword the beginning...using the same wording or phrase that you used in your grabber is a nice way to end your speech. It ties it all together!
End with a quote...
"Remember, 'Most sharks seem to be afraid of people,' so don't be afraid to go into the water."
End with a question...
"How many of you will think twice about going swimming in the ocean now?"
End with a feeling...
"I was thrilled to share my knowledge of sharks with you today."
Hopefully those examples will help you as you are thinking of how to end your speech. Here is how NOT to end your speech:
...and that was my Discovery Quest.
...that's it.
...I'm done.
...the end.
...I hope you liked learning about...