bio voacabulary chapter 17
Terms
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- fossil record
- information about past life
- relative dating
- the age of a fossil is determined by comparing its placement with that of fossils in other layers of rock.
- index fossil
- used to compare the relative ages of fossils
- half life
- the length of time required for half of the radioactive atoms in a sample to decay
- radioactive dating
- is the use of half lives to determine the age of a sample
- geologic time scale
- used to represent evolutionary time
- eras
- three periods of time between precambrian and present. they include: palezoic, mesozoic, and cenozoic.
- proteinoid microspheres
- tiny bubbles formed by large organic molecules
- endosymbiotic theory
- proposes that eukaryotic cells arose from living communities formed by prokaryotic organisms
- macroevolution
- large scale evolutionary changes that take place over lonf periods of time
- adaptive radiation
- studies of fossils show that a single species has evolved into several different forms that live in different ways
- convergent evolution
- unrelated organisms come to resemble one another
- co evolution
- two species evolve in respoce to changes in each other over time
- punctuated evolution
- pattern of long, stable periods interrupted by breif periods of more rapid changes