Biology is a natural science concerned with the study of life and living organisms. Modern biology is a vast and eclectic field composed of many specialized disciplines that study the structure, function, growth, distribution, evolution, or other features of living organisms. However, despite the broad scope of biology, there are certain general and unifying concepts that govern all study and research:
the cell is the basic unit of life
genes (consisting of DNA) are the basic unit of heredity
evolution accounts for the unity and diversity seen among living organisms
all organisms survive by consuming and transforming energy
all organisms maintain a stable internal environment