As People Burn Fossil Fuels, CO₂ Is Released into the Atmosphere

Multiple Choice

As people burn fossil fuels, CO₂ is released into the atmosphere, and almost half of this excess CO₂ dissolves into the oceans, where it forms acidic compounds, lowering the ocean pH.In ecological terms, this process is an example of

A) energy flow.
B) nutrient cycling.
C) primary productivity.
D) photosynthesis.
E) chemosynthesis.