Aspecies of bird was well established on an island. its beak was well-structured for cracking large nuts. after a few years, some larger birds arrived from a neighboring island. these larger birds drove away the smaller native birds and ate all the large nuts, ignoring the other varieties of nuts. over a period of time, the native birds seemed to have developed smaller beaks than before. explain the most likely reason for the change in these birds.

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.