Hello There! ^_^
Your question: Too much _______ for children can be toxic, including symptoms of nausea, vomiting, rapid heartbeat, and diarrhea.
Your answer: Too much iron for children can be toxic, including symptoms of nausea, vomiting, rapid heartbeat and diarrhea.
The answer is iron to fill up the black.
Hope this helps! :D
Introspection involves reporting your thoughts, feelings, and: sensations
