We do this every year at my daughter and son's school. I have one question that you need to have the answer for, because we get it every year, and the first time I didn't know the answer.
Why is a snake's tongue forked? Man, I didn't have the answer to that, but I do now.
p.s. You would be amazed at what a 3rd/4th grader will know, and want to ask. As long as you don't get to heavy into genetics, they pretty much want to know everything you can research.
Good luck,
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