Introduction Evolution is the story of change in life forms over time. From the origin of the universe to the development of complex organisms, evolution explains how flora and fauna have transformed across billions of years. For students preparing for exams like NEET, this topic is crucial, as it often contributes several questions. Let’s explore the key concepts in a structured way. Origin of the Universe The most widely accepted explanation for the universe’s origin is the Big Bang Theory, which occurred around 20 billion years ago. - A massive explosion led to expansion and cooling. - Hydrogen and helium formed, which condensed under gravity to create galaxies. - Our galaxy is the Milky Way, also called the Akash Ganga. - Observing stars means looking into the past, since their light takes years to reach Earth. Distances in space are measured in light years. Origin of Earth Earth formed approximately 4.5 billion...
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