Why does the oxygen atom in a water molecule have a negative charge?
a.
hydrogen bonding pulls electrons toward oxygen.
b.
water is made of two ionic bonds.
c.
oxygen attracts electrons more strongly than hydrogen does.
d.
water is a nonpolar molecule.

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.