1. Diversity of life forms
Evolution

2. What is evolution
It is the slow process that leads to modification in living organisms
These modifications allow them to adapt to changes in their environment.
Individuals that have characteristics which give them an advantage are more likely to survive and reproduce.
This Photo by Unknown Author is licensed under CC BY-NC-SA

3. Stages of evolution Stage 0
The giraffe’s predecessors did not have long necks or long legs.
The ‘’little giraffes’’ grazed on grass.

4. Stages of evolution Stage 1 : There is a change in the environment.
The grass becomes more rare.
More competition between species
Some giraffes start eating leaves on trees

5. Stages of evolution
Stage 2 : Individuals in the ‘’small giraffe’’ population are not all identical
Some giraffes are slightly bigger and have a slightly longer neck than others.

6. Stages of evolution Stage 3 : Natural selection occurs
The larger giraffes can eat leaves that are higher up on threes.
=Better shape = Escape predators more easily = More chance they reproduce

7. Stages of evolution
Stage 4 : The selected characteristics are hereditary
A hereditary characteristic is passed down from parents to their young
From one generation to the next, the biggest giraffes have had better chances of survival

8. Stages of evolution
Stage 5 : Giraffes have adapted to their new environment
Over time, ‘’ small giraffes’’ are replaced by ‘’big giraffes.’’
‘’Big giraffes’’ became a new species