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The activity of the modern sample is 1.10 bq . how long does that measurement take?

One of the reasons that stars are so large is because

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?