Increased Carbon Dioxide Levels in the Atmosphere Have Contributed to Acidification

Multiple Choice

Increased carbon dioxide levels in the atmosphere have contributed to acidification of the oceans.This change of the water's pH due to a change in CO₂ concentrations is an example of

A) how global warming has affected a biotic factor in the biosphere.
B) how global warming has affected an abiotic factor in the biosphere.
C) how human activities have affected a biotic factor in the biosphere.
D) how human activities have affected an abiotic factor in the biosphere.