The answer is B. Speed up chemical reactions. Hope this helps.
The best model there is for the carbon cycle
Jet Streams: are fast flowing air currents that occur in the atmosphere of Earth and other planets.
Global wind belts: Are formed by the Earth's spin and the unequal heating of the Earth by sunlight.
1) is right option. The fossils are an extinct specie of elephants, and they're related to present day elephants.
Classification systems are systems with a distribution of classes created according to common relations or affinities
