Name: ___________________________ SBI3U Introduction to Evolution Notes Handout What is a Scientific Theory? - In science, a theory is a statement that makes and explains _____________ about a group of _______________ and ______________ - It explains observations and allows us to make predictions about the natural world - Scientific theories are not _______________: they can be revised in the light of new evidence - Examples of theories: ___________________________ Theory of Evolution: - A scientific theory that helps us to understand the ___________________ and ___________________ of life on Earth - Evolution is not a theory about the origin of life. It is a theory explaining _____________ ____________________________________________________________ ___________ - - Considered to be a “unifying” theory because it answers many of our questions: o Why do humans have an appendix if we don’t use it? o Why is there fossil evidence of organisms that no longer exist? Evolution is not linear... - Evolution is a complex, meandering tree of variable _________________ - These populations branch and change over _________________________________. - Modern species do not evolve into other modern species, but rather split repeatedly into multiple lineages.
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Name: ___________________________SBI3U Introduction to EvolutionNotes Handout
What is a Scientific Theory?- In science, a theory is a statement that makes and explains
_____________ about a group of _______________ and ______________- It explains observations and allows us to make predictions about the
natural world- Scientific theories are not _______________: they can be revised in the
light of new evidence - Examples of theories: ___________________________
Theory of Evolution:- A scientific theory that helps us to understand the ___________________
and ___________________ of life on Earth- Evolution is not a theory about the origin of life. It is a theory
- Humans and chimpanzees share more than 90% of their __________________________
- Scientists believe this common ancestor existed 5-8 millions years ago, when the species diverged into 2 separate lineages; one evolving into _____________________________, the other into ___________________________(____________________).
FALSE: Evolution is the progressive improvement of species
- Evolution does not create ____________________________ and eliminate the weak.
- Rather, there are many organisms that are not perfectly adapted to their environment.
- For example, sharks do not have a gas bladder to control their buoyancy in the water.
- Evolution can only randomly favour the ______________________________________________________________!!!
Scientific Investigation Activity:- See the worksheet titled “Scientific Investigation Activity” provided.- Video link: https://www.pbs.org/video/deep-look-lizards/