What is dispersal of seeds
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Explanation is in the file

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Seed dispersal is the development, spread or transport of seeds from the parent plant. Plants have restricted versatility and depend upon an assortment of dispersal vectors to move their propagules, including both abiotic vectors like the breeze and living (biotic) vectors like birds.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).