Evolution

• All living things share a common

 ancestor. 

show how every species is related.

•Where food was limited,

 competition meant that only

 the fittest would survive

•This would lead to the natural selection

 of the best adapted individuals and

 eventually the evolution of a new species

the moth

 rested became soot-covered

poorly camouflaged from predators)

 and selected for the dark colour allele

Natural variation--differences among individuals of a species

Survival of the Fittest-Some individuals better suited for the environment

Existence-members of each species have to compete for food

Individuals in nature differ from one another

Organisms in nature produce more offspring than can survive

individuals best suited for the environment survive and reproduce most successful

Species change over time

increase genetic variation

 within a population.

hair colour

 comprises brown/blonde