SCIENCEE
Terms
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- absolute dating
- determine actual age of fossil, compare amount of radioactive element in sample to amount of element into which it breaks down
- species
- group of similar organisms that can mate with each other and produce fertile offspring
- how fossils form
- organisms that die become buried in sediments
- relative dating
- determine which of two fossils is older, look at layers of rock
- variation
- difference between individuals of the same species
- extinct
- no members of species are alive
- overproduction
- species produce more offspring than can survive
- fossil
- preserved remains or traces of an organism that lived in the past
- scientists compare organisms
- body structure, developement before birth, DNA sequences, fossils
- fossil record
- millions of fossils that scientists have collected
- peetfrified fossils
- minerals replace remains, changing them into rock
- sedimentary rock
- layers of sediments build up and harden
- continental drift
- pangea split apart
- earth began
- 4.6 billion years ago
- radioactive elements
- unstable elements that decay into different elements
- cast
- mld becomes filled with hardened materials, copy of shape of organism
- branching tree
- diagram that shows how scientists think different groups of organisms are related
- half-life
- time it takes for half the atoms of a sample to decay
- natural selection
- process by which individuals
- mold
- hollow space in sediment in the shape of an organism or part of an organism
- Charles Darwin
- naturalist, created theory of evolution
- adaptation
- trait that helps an organism survive and reproduce
- homologous
- similar structures that related species have inherited from a common ancestor
- Pangea
- all continents together
- sediments
- particles of soil and rock
- evolution
- gradual change in species over time
- scientific theory
- well-tested concept that explains a wide range of observations
- isolation
- group of individuals is seperated from rest of species, new species form
- competition
- offspring compete for limited resources