Frequency - the number of complete waves produced per second, Biological control - use predators to reduce the number of pests., Microbes - tiny living organisms around us that are too small to be seen with our eyes without a microscope, Fitness - ability to carry out physical activities, Health - the state of being free from illness and diseases, Dislocation - bones are forced out of their natural positions, Sprain - ligament overstretched or torn, Arthritis - painful inflammation and stiffness of the joints,

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