* Genetic Variation: This refers to differences in the genetic makeup of individuals within a population. It arises from changes in the DNA sequence, such as mutations, which can lead to different alleles (alternative forms of a gene) being present in different individuals. Genetic variation is passed down from parents to offspring, and it is the foundation for evolution. Examples include differences in eye color, hair color, blood type, and susceptibility to certain diseases.

* Environmental Variation: This refers to differences in traits that are a result of environmental influences rather than genetic differences. These variations are not inherited. For example, a plant grown in full sunlight will be taller and greener than the same type of plant grown in shade. Environmental variation can also affect an organism's phenotype, but it does not change the genotype. Examples include differences in height, weight, muscle mass, and skin tone due to environmental factors like nutrition, sunlight exposure, and exercise.

It's important to note that both types of variation can interact. A genetic predisposition towards a certain trait can be enhanced or diminished by environmental factors. For example, individuals with a genetic predisposition towards obesity may develop the condition if they have a sedentary lifestyle and consume a high-calorie diet.