Biology

Life and living organisms

Artistic rendering of the DNA double helix with nucleotide base pairs highlighted in blue and orange
biology

DNA and RNA: The Building Blocks of Life

Explore the structure of DNA and RNA, how the double helix stores genetic information, and how the central dogma drives protein synthesis.

16 min readRead article →
Sunlight streaming through green leaves in a forest, illustrating photosynthesis in action
biology

Photosynthesis: How Plants Make Food

Discover how photosynthesis works — from chloroplasts and light reactions to the Calvin cycle — and why it is the engine that powers nearly all life on Earth.

14 min readRead article →
Illustration of the human nervous system showing the brain, spinal cord, and branching peripheral nerves throughout the body
biology

An Overview of the Human Nervous System

A complete guide to the human nervous system — neurons, CNS, PNS, how nerve signals travel, the brain's key regions, and the autonomic nervous system.

15 min readRead article →
Illustration of Darwin's Galápagos finches showing variation in beak shapes adapted to different food sources
biology

How Natural Selection Works

Understand natural selection — Darwin's great insight, the four conditions that drive it, and real-world examples from finches to antibiotic resistance.

14 min readRead article →
Important Facts About Cells
biology

Important Facts About Cells

Discover the fundamental building blocks of life with essential facts about cell biology and structure.

12 min readRead article →
What Are Tissues
biology

What are Tissues?

Learn about biological tissues, how specialized cells group together to perform complex functions in living organisms.

16 min readRead article →