Carbon dioxide levels above normal will increase plant growth.
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The statement is true. Carbon dioxide above normal will increase plant growth provided all other conditions are suitable. Plants needs carbon dioxide to carry out the process of photosynthesis. When carbond dioxide is available in excess, plants tend to increase their rate of photosynthesis.

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.