How do the cryosphere and hydrosphere affect ocean salinity

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

Which of the following statements best explains why there tends to be a greater number of large cities in southern africa than the east africa

Exactly what kind of weather conditions would a cold front produce?