B16- Evolution Flashcards
What is evolution?
Change in the inherited characteristics of a species over time through natural selection, sometimes resulting in the formation of a new species
What is the theory of evolution by natural selection?
The organisms best adapted to their environment survive and pass on their characteristics to their offspring.
What evidence supports the theory of natural selection?
Parents pas characteristics on through genes, fossil record, evolution of antibiotic resistant bacteria
What are fossils?
Remains of organisms from millions of years ago found in rocks
How are fossils formed? (3)
Parts of organisms do not decay as the conditions needed for decay are absent, traces of organisms are preserved, parts of an organism are replaced with minerals
What are the benefits of the fossil record?
Understanding of how species changed over time and how life developed on earth, tracking the movement of organisms across the world
What are the problems with the fossil record?
Early organisms were soft bodied so left few fossils, not all fossils have been discovered and some have been destroyed
What is extinction?
No individuals of a species are still alive
What factors contribute to extinction?
Predators, disease or pathogens, competition, catastrophic events, changes in habitat
What is the binomial system?
Naming organisms by their genus and species
What is the three domain system split into?
Archaea, bacteria, eukaryota
What are archaea?
Primitive bacteria living inn extreme environments
Who proposed the three domain system
Carl woese
What is the order of classification?
Kingdom
Phylum
Class
Order
Family
Genus
Species
Who proposed the classification of living organisms?
Carl Linnaeus
