What would most likely happen if airborne pollution blocked the sun's rays so significantly that only 5% of plants survived?

This would produce a mass extinction mainly due to the lack of primary producers  

Explanation:

Primary producers are autotrophs organisms capable of converting solar energy and inorganic compounds (such as, for example, water and carbon dioxide) into chemical energy and organic matter. Primary producers include algae, plants, and certain bacteria. These organisms are critical for sustaining trophic interactions by synthesizing and assimilating nutrients required to sustain the life of heterotrophic organisms. Consequently, an environmental disaster like described in this question would have devastating consequences on the next trophic levels in food chain by eliminating a major source of food for heterotrophic life.

this is a good question! i'll do some research and come back when i have the answer!

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.