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Evolution Origin of species. 3 billions years ago to today.

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Evolution Evolution Origin of species Origin of species
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Page 1: Evolution Origin of species. 3 billions years ago to today.

EvolutionEvolution

Origin of speciesOrigin of species

Page 2: Evolution Origin of species. 3 billions years ago to today.

3 billions years ago to today3 billions years ago to today

Page 3: Evolution Origin of species. 3 billions years ago to today.

Evolution – the theoryEvolution – the theory‘Natural selection’‘Natural selection’

Charles Darwin 1809-1882 1803180(Charles Darwin

1809-1882)

Page 4: Evolution Origin of species. 3 billions years ago to today.

Church versus scienceChurch versus science

It took over 50 years It took over 50 years for Darwin's theory to for Darwin's theory to be accepted. His be accepted. His ideas went against ideas went against the ‘God created the the ‘God created the World’World’

He was ridiculed by He was ridiculed by the pressthe press

Page 5: Evolution Origin of species. 3 billions years ago to today.

Are our ancestors the apes?Are our ancestors the apes?

Page 6: Evolution Origin of species. 3 billions years ago to today.
Page 7: Evolution Origin of species. 3 billions years ago to today.

Homo erectusHomo erectus

Erect man – as in standing erect i.e. upright

(so put any other thoughts out of your mind!)

The pelvis of primates prevents them from walking upright easily – homo erectus is a link in the evolutionary chain to modern man from the primates

Page 8: Evolution Origin of species. 3 billions years ago to today.

EvidenceEvidence

Page 9: Evolution Origin of species. 3 billions years ago to today.
Page 10: Evolution Origin of species. 3 billions years ago to today.
Page 11: Evolution Origin of species. 3 billions years ago to today.

Capacity of skull - brainCapacity of skull - brain

Page 12: Evolution Origin of species. 3 billions years ago to today.
Page 13: Evolution Origin of species. 3 billions years ago to today.

Evolution is the slow, continual change of organisms over a very long

time. All living things on the Earth have developed from the first simple life forms that arrived 3,000,000,000

years ago.One of the effects of evolution is that species will become

better adapted to their environment. If these species don’t adapt they may become extinct due to being unable to deal with any of these factors…

1) Increased competition

2) Changes in the environment

3) New diseases

4) New predators

Page 14: Evolution Origin of species. 3 billions years ago to today.

My key observations:1) All living things produce more

offspring than survive to adulthood

2) In spite of this, population sizes remain roughly constant

3) Variation exists among species4) Characteristics can be passed on

from one generation to the next.

These observations led me to the conclusion that species evolve over a along period of time by a mechanism called “Natural Selection”. The main evidence for this is from fossil records.

Page 15: Evolution Origin of species. 3 billions years ago to today.

Natural SelectionNatural Selection1) Each species shows variation:

2) There is competition within each species for food, living space, water, mates etc

4) These survivors will pass on their better genes to their offspring who will also show this beneficial variation.

Get off my land, you lanky git

Gutted!

Yum

3) The “better adapted” members of these species are more likely to survive – “Survival of the Fittest”

Shut it - shorty

Page 16: Evolution Origin of species. 3 billions years ago to today.

Darwin vs LamarkDarwin vs Lamark

Page 17: Evolution Origin of species. 3 billions years ago to today.

LAMARK

Page 18: Evolution Origin of species. 3 billions years ago to today.

HorseHorse

Page 19: Evolution Origin of species. 3 billions years ago to today.

Pentadactyl limbPentadactyl limb

Page 20: Evolution Origin of species. 3 billions years ago to today.
Page 21: Evolution Origin of species. 3 billions years ago to today.

Extinction – adapt or dieExtinction – adapt or die


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