Question

distinguish between tropopause and stratopause??give atleast five points each of them???
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Answer 1

As nouns the difference between bract and perianth is that bract is (botany) a leaf or leaf-like structure from the axil out of which a stalk of a flower or an inflorescence arises while perianth is (botany) the sterile parts of a flower; collectively, the sepals and petals (or tepals).