The Negative Shift in Carbon Isotope Ratios at the Triassic-Jurassic

question 12

Multiple Choice

The negative shift in carbon isotope ratios at the Triassic-Jurassic boundary likely means that

• A) climate was stable, so climate change is not a factor.
• B) methane hydrates were melting.
• C) phytoplankton became less productive.
• D) bacterial respiration rates remained steady.

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