Sunday, May 21, 2017

Lifestyle of early human


Life of early human was very hard. Unlike nowadays they had to risk their lives for survival. Finding foods was not an easy task for them. They used to walk all day in search of foods. Since humans were small in comparison to other wild animals, they had to protect themselves from them. So, to get protection from wild animals, extreme weathers, early human started living in a cave. (The reason they are call caveman).

Firstly, early humans used to eat fruits and roots of plants for foods. But after discovering weapon tools, they started hunting. So, we can consider our ancestor as omnivorous. Early humans were free travelers. They used to travel various places for better shelter and foods. From the fear of being hunted by wild animals they didn’t use to sit in a place for much longer time.

From the beginning of our evolution, humans were social animals. They used to live in groups. This helped them in many ways. Living in groups provided security to them from strangers. Larger no of people meant greater possibility of finding foods, easier hunting and many other advantages. This practice later turned out to be of significant use. Human beings started creating families and societies. They discovered farming, started domesticating animals and lived away from the wild.






Tuesday, May 2, 2017

Human Evolution: Introduction

Paleoanthropologist (people who does scientific study of human evolution) believes that human was evolved from an ape like creature that existed some 6-8 million years ago. It was the common ancestor of modern humans, apes, gorillas, chimpanzees. That’s why we resemble in appearance.

Researches proves that humans evolved in Africa, and much of our evolution occurred there. Fossils of early human that lived 6-8 million years ago entirely come from this continent. So, we all were African at the beginning of our evolution. Early human first migrated out of Africa into Asia probably between 1.8-2 million years ago. They then entered Europe some 1-1.5 million years ago and another continent much later.



Bipedalism (ability to walk on two legs) plays vital role in human evolution. Human ancestor used to walk on four legs. Our ability to walk on two legs evolved over 4 million years ago. If somehow, we were not able to walk on two legs, we wouldn’t have made it this far. This ability was evolved when we left trees and started to live on land. Bipedalism changed the internal skeletal system of early human. Their spinal cord had to adapt accordingly. Bipedalism is believed to have set the foundation for early human to evolve into homo sapiens.

( I will be writing on lifestyles of early human in the next blog) 

Saturday, April 8, 2017

What Is Evolution



Evolution simply is the development of life on earth. This is a process that began billions of years ago and is still happening. Every living things we see today are the result of million years of evolution. So, evolution is a very slow process that happens throughout the entire life of any organism till its extinction.     
So, how does evolution occurs?
All healthy living creatures, from a single cell amoebas, plants, mammals, birds, to human, everyone are capable of reproduction. We have capability of making copies of ourselves. We do this by duplicating our DNA and passing the DNA to our future generation.
DNA are chain like structures that is present in our cell. Our physical appearance, our body size, our skin color, everything we are is the result of our DNA. We can simply understand that our DNA has the coded information on what we are. The information in our DNA varies with other creatures. That’s why we differ from them.

While reproduction, if all goes well then, the offspring produced will look exactly the same as the parents. But in nature, things aren’t always perfect. When DNA is being copied, errors can occur that modifies the DNA code. This is called the DNA mutation.  The DNA mutation can create variation in the body and characteristics of the creatures who inherits the modified DNA. If the newly created species survives long enough to reproduce, it passes its unique coded DNA to its children. This is an everlasting process that has been undergoing since the occurrence of living creature. In order to continue the generation of one’s type, the living creature has to survive in the nature.