*Next Generation Science Standards and logo are registered trademarks of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards was involved in the production of, and does not endorse, this product.
Houghton Mifflin Harcourt™ and ScienceSaurus® are trademarks or registered trademarks of Houghton Mifflin Harcourt. Modern Chemistry® is a registered trademark of HMH Publishers LLC. Science Spectrum® is a registered trademark Science Spectrum, and used under license by Holt McDougal.