A student is writing the introduction to an opinion piece about endangered species. Which sentence should he include in the introduction to most clearly present his topic?
Today, however, many animal species are disappearing.
In some ways, animal species are very similar to human beings.
Animals have shared the earth with people for thousands of years.
There is much to be learned by studying animals in the wild.

1. saved aronnax from drowning "an incident" 2. speed of the nautilus man-of-war 3. next to captain nemo conseil 4. electricity vigo bay 5. "a coral tomb" 20,000 leagues 6. the nautilus runs aground nemo's "thunderbolt" 7. episodes are connected by aronnax's quarters 8. captain nemo's "bank" cause 9. distance aronnax traveled on the nautilus "a fine death for a sailor" 10. captain nemo sinks for revenge 50 miles per hour