CHAPTER 7
EVOLUTION
CHAPTER AT A GLANCE
Evolution
Evolutionary Biology explores the evolutionary history of life forms on Earth.
Origin of Life
- The commencement of life is viewed as an exceptional occurrence in the vast history of the universe. The expanse of the universe is immense, making Earth appear minuscule in comparison. The universe has an extensive timeline, spanning nearly 20 billion years. The theory of the Big Bang endeavours to elucidate the universe’s inception, depicting an incomprehensibly colossal explosion in physical terms. Earth, within the solar system of the Milky Way Galaxy, is estimated to have taken form approximately 4.5 billion years ago. During its early stages, Earth lacked an atmosphere, with water vapour, methane, ...
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