Natural numbers are not closed under subtraction. While subtracting a smaller number from a larger one works, subtracting a larger number from a smaller one, like 3 minus 5, results in a negative value.
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The listed numbers are all prime numbers, meaning they have no factors other than 1 and themselves. Following this mathematical pattern, the next three consecutive prime numbers are 23, 29, and 31.
Pruning stimulates meristematic growth and branching. Grafting joins conducting tissues for nutrient transport. Irrigation maintains healthy tissues through water supply. Crop rotation improves soil nutrients, supporting growth, conducting and supporting tissues, while reducing disease and improving plant health.
Practices like yoga and kabaddi strengthen muscles, improve flexibility and maintain bone health. Regular physical activity improves posture, coordination and balance, increases blood circulation and reduces the risk of obesity, stiffness, weak bones and muscle injuries.
Ligament rupture causes joint instability, cartilage rupture damages cushioning and bone fracture breaks bones. Risks can be reduced through exercise, yoga, balanced diet rich in calcium and vitamin D, maintaining posture and avoiding unsafe movements or accidents.