The medium ground finch lives on the galapagos islands. birds with beaks of all sizes were originally part of this population. the finches are seed eaters. the types of food available for them to eat depends on the weather. during wet years, there is a large variety of food. during dry years, there is less food, and large, tough seeds are more abundant than small seeds.

after a long drought, researchers noticed certain differences in the population of medium ground finches living compared to those who lived before the drought. what was different about the finches after the drought?
a.
they had smaller beaks.
b.
they were a new species.
c.
they were smaller.
d.
they had larger beaks.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.