Presentation on theme: "Evolution Origin of species. 3 billions years ago to today."— Presentation transcript:
Evolution Origin of species
3 billions years ago to today
Evolution – the theory ‘Natural selection’ Charles Darwin (Charles Darwin )
Church versus science It took over 50 years for Darwin's theory to be accepted. His ideas went against the ‘God created the World’ It took over 50 years for Darwin's theory to be accepted. His ideas went against the ‘God created the World’ He was ridiculed by the press He was ridiculed by the press
Are our ancestors the apes?
Homo 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
Capacity of skull - brain
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
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 species 4)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.
Natural Selection 1) 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