Correct definition of circulatory system

Assume you were going to teach this information to a group of seventh graders. pick a title for your presentation that would make the seventh graders want to listen to you.

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Describe the potential effects, on people, of unprotected exposure to the sun.give an example of 1 new thing have you learned about the sun’s uv rays.