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Ask Dr. Universe Archives

Dr. Universe: Why do trees have sap? -Aliyah, 8, Kirkland, WA  

Just as blood moves important stuff around the human body, sugary sap moves important things around a tree. My friend Nadia Valverdi told me all about it. She’s a researcher at Washington State University who studies how apple and cherry trees survive in different environments. When we eat food, like a delicious apple or a handful of cherries, we get important nutrients. Read More ...