Understanding cells and organisms is the foundation of biology. These tiny units make up all living things, from the smallest bacteria to the largest whales.

What is a Cell?

Types of Cells

There are two main types: prokaryotic cells (simple, without a nucleus) and eukaryotic cells (complex, with a nucleus). Plants, animals, fungi, and protists have eukaryotic cells.

How Cells Form Organisms

Cells group together to form tissues, tissues form organs, and organs make up organ systems. Together, these systems create fully functioning organisms capable of growth, reproduction, and adaptation.

Why It Matters

Studying cells helps us understand health, disease, and how living things survive. It also provides insights into genetics, medicine, and biotechnology.

Final Thought: By learning about cells and how they combine into organisms, students gain a deeper appreciation for the complexity of life and the science behind it.