Scientists measured the beak length of a population of birds in a lake in 1960. They measured the beak length of the bird population again in 2010. When was there more variation (spread in lengths) in the beak lengths of the birds by the lake?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.