What happens when the top predator on an ecosystem disappears? Scholars explore this idea through an introduction example and four case studies. They learn to analyze the importance of every member in a food pyramid to come to their...

Explore vocabulary related to three-dimensional shapes. An instructional website describes the characteristics of different geometric solids. Learners can use an interactive component to view nets, faces, vertices, and edges of common...

How do you get a theorem named after you? Euler knows what it takes! The third lesson of five asks pupils to use an interactive activity to compare the faces, vertices, and edges of seven different three-dimensional solids. They use...