What is known and unknown about the effects on young children of chemicals in the food, air, and water?

Remember to answer the discussion question in APA format with at least 1 source cited and be at least 250 words long. This part is worth 50 points. By Sunday of the same week, you must read and respond to 3 classmates for full credit. Responses are worth 10 points per response for a combined total of 80 points each week . Remember to include at least 1 source at the end and 1 in text citation (Smith,2015) in the essay.
Question: What is known and unknown about the effects on young children of chemicals in the food, air, and water? How much progress has been made in eliminating these elements over the last 80 years in the US?