1. By Heman Nama Andrew Gardella
EVOLUTION OF LIFE
By Heman Nama
Andrew Gardella

2. The Evolution of Life
Life began on Earth around 4 billion years ago and has been evolving since that time.
At first, all living things were single celled organisms

3. The Evolution of Life
The first multi celled organisms appeared about 600 millions years ago
The multi celled organisms took longer to evolve as they had much more complexity than the single celled organisms

4. Evolution of Life

5. Charles Darwin Born on Feb 12 , 1809
He was a naturalist( expert of natural history)
Embarked on a 5 year adventure on the HMS Beagle
His studies of specimen around the globe led him to formulate the Theory of Evolution and his views on the process of Natural selection
In 1859, he published On the Origin of Species

6. Natural Selection
Natural selection is the process through which evolution occurs
It is the driving force of evolution

7. Natural Selection
All organisms are born with small variations (mutations)
But Nature gets to select which ones can reproduce (mainly by killing the others)

8. Example of Natural Selection
Suppose a new fast swimming shark moves into a turtle’s habitat
The turtle population has variation. Some are fast and some are slow swimmers
Turtles that are able to swim faster are better adapted because they can swim away from the shark

9. Example of Natural Selection
Fast swimming turtles will survive
They will reproduce and pass on their “fast swimming” genes.
Over time, the turtle population will evolve and more turtles will be able to swim faster

10. Adaptation
Trait that helps an organism survive in its environment
Adaptations have allowed katydids to mimick leaves to avoid predators

11. The Difference Between Natural Selection and Adaptation
Whole groups of species adapt to their environment
For example, many species of animals might grow thicker fur in close climates to adapt to the cold temperatures

12. The Difference Between Natural Selection and Adaptation
Natural selection is “survival of the fittest”
Some of the animals with thicker fur might die out and others survive
Adaption and natural selection are steps in evolution