Learners examine how CEC, base saturation, and soil pH work with each other to define plant nutrient availability.

In this interactive object, learners complete dental formulas for various species of animals.

Students read how to determine and calculate the degree of saturation for a given sample of soil or aggregate based on the weight-volume relationship.

Students read how to determine and calculate the dry unit weight for a given sample of soil or aggregate based on the weight-volume relationship.

In this interactive object, learners sort parasites into divisions and helminth divisions. They also identify affected body systems.