Answer:
At first, we should know their molecular formula and symbol. In case of element, symbols are written. But in case of compound, molecular formula is used. Also we should know their coefficient (number) to make the number of atoms either side equal.
The primary function of the respiratory system is to supply blood with oxygen
Plants stomata allow it to transpire and is also a mechanism used to 'suction' or 'pull' the water through the xylem
