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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.
If experiments do not support the hypothesis, the hypothesis is always rejected or wrong. True or False?
Which of the vertebrate classes (a) are 'warm-blooded', (b) reproduce by laying eggs? (a) Birds and mammals are 'warm-blooded'. (b) Fish, Amphibia, Reptiles
i want to know about sericulture for assignment degree level
What mechanism of regulation is utilized in maintaining homeostatic balance of sugar?
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