Why are there so many different shaped beaks in finches

Beaks changed as the birds developed different tastes.

Explanation:

Fruits, seeds, or insects picked from the ground or cacti have affected their evolution.  Long, pointed beaks made some of them more fit for picking seeds out of cactus fruits. Shorter, stouter beaks served best for eating seeds found on the ground.

Because of evolution. If a bird needs to get things deep in the dirt, their beaks would be longer. If they are getting big berries, there beaks will be bigger. If their foods are softer, their beaks will be weaker, etc.

Explanation:

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.