Why must all living things carry on respiration

To break down food molecules and turn it into energy.

Explanation:

All living organisms must carry on releasing the energy stored in food molecules through a chemical process known as the respiration.

The main purpose of respiration by the living things is to break down the sugar (glucose) and turn it into energy, in the form of ATP (adenosine triphosphate), which is then used to perform some essential activities of life.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.