History and meaning of biology

Understand the idea

Biology is the scientific study of life. It covers every living thing, from bacteria you cannot see to whales, and from a single cell to a whole forest. The word itself is modern, but people have watched plants and animals for thousands of years.

Early farmers in Egypt and Mesopotamia grew crops and kept animals. In Greece, Aristotle grouped animals by what he could see. Later, Ibn Sina wrote about medicine and plants. Vesalius mapped the human body by dissection, and William Harvey showed that blood circulates.

The microscope opened a hidden world: Hooke named cells in cork, and Leeuwenhoek saw microbes. Linnaeus gave organisms two-part names. Darwin explained how species change by natural selection. Mendel’s rules of inheritance were rediscovered, and Watson and Crick described the structure of DNA.

What to remember

• Biology = scientific study of life.
• Aristotle classified; Linnaeus named; Darwin explained change; Watson and Crick described DNA.
• Microscopes made cells and microbes visible.

Recap

Biology studies living things. Ancient observation led to classification, anatomy, microscopy, evolution, and DNA. Keep the order of those discoveries when you explain the subject.