https://studyandupdates.in/the-most-abundant-element-by-number-in-the-living-system-is-%e0%a4%b8%e0%a4%9c%e0%a5%80%e0%a4%b5-%e0%a4%a4%e0%a4%82%e0%a4%a4%e0%a5%8d%e0%a4%b0-%e0%a4%ae%e0%a5%87%e0%a4%82-%e0%a4%b8%e0%a4%82%e0%a4%96/