Out of the following given choices
A. acids B. nutrients C. roots D. soil?
The answer A. Lichens and Moses secrete organic acids. An example of a secreted organic acid is oxalic acid. These acids react with mineral in the rocks hence dissolving them. Their decaying vegetation (humus) also produces acids that weather the rocks. Another way these plants break rocks are physically using their roots that grow in the cracks and grow bigger.