Darwin published this work to explain the variety of species that exist on the planet
He proposed the “Theory of Evolution by Natural Selection”
1. Variation exists among individuals in a species.2. Individuals will compete for resources (food, mates, and space)3. Competition would lead to the death of some individuals while others would survive4. Individuals that had advantageous variations are more likely to survive and reproduce. This process came to be known as Natural SelectionThe favorable variations are called Adaptations Photo courtesy of digitalART2, flickr creative commons
Shows similarities between extinct animals and animals that are alive today
The earth’s layers show a time scale of species and when they appeared on earth (and when they died out)
Dinosaurs have always fascinated us, movies such as Jurassic Park capitalize on that fascination. How do we know what dinosaurs looked like? We create a picture based on the bones we find (fossils) and use modern reptiles to guess at their texture and skin color.
When comparing the DNA of one species to another, more similarities are found in species that are more closely related. Lion photo credit: ucumari Tiger photo credit: digitalART2
Embryological Development Embryos of different species develop in almost identical ways. Human fetus at 8 weeks
Direct observation of species change Bacteria become resistant to antibiotics Wolves were bred over many generations to become dogs (artificial selection) • and then bred further to create a variety of breeds
Creationism, sometimes referred to as “creation science” or “intelligent design” is the belief that organisms were placed on this earth by a divine being (God).
It is NOT a theory because it does not follow scientific principles (theories require evidence, and must be based on NATURAL PHENOMENON)
Finding gaps in our knowledge about evolution is a normal part of the scientific process, the existence of these “gaps” and questions does not qualify as evidence that an alternative theory must be correct
Many religious organizations do not have a problem with evolution, and it is compatible with their faith and beliefs.
Ask your religious leaders what their thoughts are.
Also see the National Center for Science Education for a list of statements from a variety of religious groups.