Question from campbell biology chapter 23:
4) which statement about the beak size of finches on the island of daphne major during prolonged drought is true?
a) each bird evolved a deeper, stronger beak as the drought persisted.
b) each bird's survival was strongly influenced by the depth and strength of its beak as the drought persisted.
c) each bird that survived the drought produced only offspring with deeper, stronger beaks than seen in the previous generation.
d) the frequency of the strong-beak alleles increased in each bird as the drought persisted.

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.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]