Sulfur oxides and nitrogen oxides form from the burning of fossil fuels for energy. these gases combine with water in the atmosphere and can form acid precipitation. organisms living in affected aquatic environments often suffer decreased cell function due to
a) decreased ph levels.
b) increased ph levels.
c) decreased temperatures.
d) increased temperatures.

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.