Which species is the conjugate base of H2SO3

Explanation:

As you know, the conjugate base of an acid is determined by looking at the compound that's left behind after the acid donates one of its acidic hydrogen atoms.

The compound to which the acid donates a proton acts as a base. The conjugate base of the acid will be the compound that reforms the acid by accepting a proton.

In this case, sulfurous acid has two protons to donate. However, the conjugate base of sulfurous acid will be the compound left behind after the first hydrogen ion is donated.

Carbon has four electrons in its outermost shell, with these it forms covalent bond with other elements by sharing electrons with them.
The elements that made up the biological molecules react easily with carbon, giving rise to different types of macro molecules. Besides this, carbon is flexible and can conform to any shape whether linear, coiled, ring or ball form.