The fast evolution of species with a common ancestor.
How to define direct variation.
Understanding the concept of genetic variation.
How to define indirect variation.
Explanation of plant adaptation.
How to define joint and combined variation.
How to tell if two variables vary inversely.
How to tell if two variables vary directly.
Understanding the variations in the structure and composition of individual molecules with the same chemical formula.
How to graphically depict the variation in the energy of substances involved in reactions as they progress from reactants to products.