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How can the age of a tree be estimated from the analysis of the rings present on a cross section of its stem?
For the growth of the tree it is essential to have formation of new vessels within the stem, a task performed by the vascular cambium. The vascular cambium is more active in hot seasons (spring and summer) forming a lighter band made of large calibered vessels. During winter and fall the vascular cambium makes the opposite, so small calibered vessels and a darker band appears outside the previous lighter band. Therefore a two ring bands are made yearly, one lighter and the other darker. By a direct count of these band pairs one can estimate the age of the tree.
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What type of compound is the major metabolic waste of Porifera? Why is it important for the organism to get rid of this compound?
Q. Investigation of aortic regurgitation by Serial Testing? Serial testing is indicated in asymptomatic patients with severe AR and preserved LV function since LV dysfunction m
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