This document provides an introduction to the key concepts in biology. It discusses that biology is the study of life, which first appeared over 3.5 billion years ago in single-celled organisms. Over time, organisms evolved and new species arose. The document outlines several main themes in biology, including cell structure and function, homeostasis, reproduction/inheritance, evolution, and interdependence among organisms. It also discusses the scientific method and different types of microscopes used to study cells and biology.
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