A cell is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life that can replicate independently, and cells are often called the "building blocks of life."

Here are some key aspects of cells:

• Structure: Cells typically consist of a membrane enclosing a cytoplasm, which contains various biomolecules such as proteins, nucleic acids, and lipids.
• Types: There are two main types of cells:
  • Prokaryotic cells: These cells lack a nucleus and other complex organelles. Bacteria and archaea are examples of prokaryotic organisms.
  • Eukaryotic cells: These cells have a nucleus and other membrane-bound organelles. Plants, animals, fungi, and protists are composed of eukaryotic cells.
• Function: Cells carry out various functions necessary for life, including metabolism, growth, reproduction, and response to stimuli.

For more in-depth information, you can refer to these resources:

• National Center for Biotechnology Information - The Cell
• Nature - Cell Biology