They're neither plants nor animals, yet they are some of the most important life forms on Earth. This video segment explores the world of microorganisms -- what they eat, how they move, what they have in common, and what distinguishes them from one another. - WGBH
BasicStudents matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient)Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
AdvancedStudents matched to this level are ready for material that requires superior performance and mastery.