According to the theory of today’s organisms evolved from past organisms. natural selection biological evolution common descent

 common descent

Explanation:

The theory of common descent suggests that the organisms which are found today has been evolved from the organisms used to live in the past. It is a scientific theory which explains the fact that all living organisms that are found on earth are the descendants of a single common ancestor that is the primitive organism. This has been confirmed by analyzing the features present in the fossil remains of the primitive organisms which are found to be nearly similar to that of the organisms living today.  

the statement is true

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.