The Building Blocks of Life

All living things are made of cells, the tiniest units of life. Some organisms, like bacteria, have just one cell. Others, like humans and trees, have trillions!

Types of Cells

• Prokaryotic Cells: Simple cells without a nucleus (like bacteria).
• Eukaryotic Cells: More complex cells with a nucleus (like plant and animal cells).

Cell Functions

Cells do everything needed for life: they take in nutrients, get rid of waste, reproduce, and respond to their environment. In multicellular organisms, cells organize into tissues, organs, and systems.

Why Are Cells Important?

Understanding cells helps doctors treat diseases and helps farmers grow healthier crops.

Real-World Applications

• Scientists use microscopes to study how cells work.
• Vaccines are developed by understanding how viruses interact with cells.