Read Paragraph 8 of the passage.

In my first days at the conservancy, I learned a lot about sea turtles, like their amazing instincts and adaptation—that a green sea turtle could hold its breath for as long as five hours, and could slow its heart rate to 10 beats per minute to conserve oxygen. What does the word conserve mean in this paragraph?

A.use

B.breathe

C.save

D.produce