Evolution

🌟Introduction

Evolution is the gradual and continues change in organism over million or years, leading to the formation of new species. It explains that diversity of life seen on earth today. Let’s study more about evolution.

📚Key concept:-

The process of formation of new species from existing ones dues to

• Genetic variation
• Natural selection
• Geographic isolation
• Mutation
• Over the time, population becomes so different that they can no longer interbreed.

Example of evolution:-

Evolution of eyes:-

• Started as simple light sensitive spotsànow developed into complex eyes in humans and animals.

Evolution of feathers:-

• Feathers first evolved for insulation in dinosauràlater used for flight in birds .

Human evolution:-

• Humans evolved from primate ancestors.
• Timeliness of Key ancestors are

Dryopithecus –> Australopithecus –> homo habilis –> homo erectus –> homo sapiens

Origin of life on earth:-

• Life began in water about 3.5 billion years ago.
• Simple Unicellular organism evolved into multicellular organism over time.