Explain the terms heredity and variation.

Heredity and variation are fundamental concepts in genetics that explain how traits are passed on and how differences arise among organisms.

Heredity refers to the transmission of genetic traits from parents to offspring through genes. These traits include physical characteristics such as height, eye color, and other inherited features.

Variation refers to the differences in characteristics among individuals of the same species. These differences may arise due to genetic factors, environmental influences, or a combination of both.

Heredity ensures the continuity of species by passing on traits, while variation introduces diversity, which is essential for adaptation and evolution.

Thus, both heredity and variation work together to shape the characteristics of organisms and support survival in changing environments.