The basic unit of life in biology is the cell. Cells are the smallest structural and functional units of living organisms.
Each cell acts as a building block for larger structures in living beings, whether they are single-celled organisms like bacteria or complex multicellular organisms like plants and animals. Every organism is made up of one or more cells, and they carry out essential functions necessary for life, such as metabolism, energy production, and reproduction.
Cells vary in shape and size depending on their function, and they contain various components, such as the nucleus, cytoplasm, and cell membrane. The study of cells is known as cell biology, which is a fundamental aspect of the life sciences.