Students contrast a weedy annual grassland of introduced species with an undisturbed, ancient plant community of native bunchgrasses and wildflowers.

Students identify the characteristics of the legs of arthropods as well as how they are used. They compare and contrast the legs of various types of bugs in the arthropod family. A comparison worksheet is included in with this lesson.

High schoolers understand how the census can reveal information about people and history. They create their own census.

The resource investigates limits and continuity using an algebraic approach. Topics examined are closed-form functions and evaluating a limit using simplification. Students learn about the calculus concepts through notes and examples.

Some trigonometric equations can be solved only numerically. But a great many can be solved in closed form and simple procedures. This web page shows you how to do it in five steps (or fewer)!

Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.