Read the excerpt from "Exploring Mars.”
The rover was made to be a complete laboratory. It carried many tools to help it study Mars. With its arm, it could brush off a rock or drill into it. It could pick up rocks and soil and bring them on board. Then it could study the samples to see what they were made of.
What is the best way to describe this excerpt?
It has one supporting detail and four central ideas.
It has one central idea and four supporting details.
It has two central ideas and three supporting details.
It has five supporting details and no central idea.
