People have been fascinated by Mars for many, many years and have wondered about the existence of life on the red planet. The book documents human attempts to observe and visit Mars using space probes. Piece by piece, we are unlocking the secrets of Mysterious Mars.

After reading the Level O books, readers should be able to progress to Level P.

Use the following to assess whether your student's progress indicates he or she is ready to move up a level:

• Level O Benchmark Book
• corresponding Running Record
• corresponding Benchmark Quick Check

Benchmark books do not have a lesson plan or worksheets.

Additional Resources
ReadingA-Z.com Printable and Projectable Book