Life has been around since the dawn of earth, nearly 4.2 billion years ago, and all the lifeforms that we see around us today are the result of many aeons of evolution. From the very first single-celled organism to the first organism to crawl on to land, life has seen a multitude of species that have evolved, dominated and became extinct.
The dinosaurs were one such group of organisms that ruled the world roughly 65 million years ago. Mammals actually walked alongside dinosaurs, but they were rather small and were very vulnerable to predation. Learn more about evolution by exploring Class 12 Biology Revision Notes Chapter 7 – Evolution, right here on BYJU’s.
Frequently asked Questions on CBSE Class 12 Biology Notes Chapter 7: Evolution
What is ‘Evolutionary genetics’?
Evolutionary genetics aims to understand the diversity of life from a genetic perspective, using DNA sequences to study population history and evolution.
What are mammals?
Any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother is called mammals.
What is a ‘Single celled’ organism?
A unicellular organism, also known as a single-celled organism, is an organism that consists of a single cell. This category includes bacteria, protists and yeast.