The troposphere is hotter near the Earth's surface because heat from the Earth warms this air. As the altitude increases the number of air molecules decreases, the average of their kinetic energy decreases.
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Answer:
Grafting
Explanation:
Tissue culture is the growth of tissues or cells in an artificial medium separate from the parent organism, whereas grafting is a horticultural technique whereby tissues of plants are joined so as to continue their growth together.
This is why the correct answer is grafting :)
Gravitational.....................
