Holt Biology Chapter 12
Terms
undefined, object
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- radiomatic dating
- estimation of the age of object by measuring it's content of certain radioactive isotopes
- radioisotopes
- unstable isotopes that break down and give off energy in the form of charged particles(radiation)
- Half life
- the time it takes for one half of a given amount of a radioisotope to decay
- microspheres
- short chains of amino acids that gather into tiny droplets
- fossil
- preserved or mineralized remains (bone tooth or shell) or imprint of an organism that lived long ago
- cyanobacteria
- photosynthetic prokaryotes 1st prokaryotes to appear
- eubacteria
- prokaryotes that contain a chemical called peptidoglycan in their cell wall
- archaebacteria
- prokaryotes that Lack peptidoglycan in cell walls and have unique lipid in cell membrane
- endosymbiosis
- theory that mitochonria are decendents of symbiotic aerobic eubacteria and chloroplasts are descendenta of symbiotic photosynthetic eubacteria
- protists
- Large group that includes both multicellular and unicellular organisms
- extinction
- death of all members of a species
- mass extinction
- episode during which large numbers of species became extinct
- mycorrhizae
-
biological partnerships
symbiotic associations between fungi and root of plants - Continental drift
- movement of the Earth's land mass over earth's surface through geologic time
- mutualism
- a relationship between two species which both species benefit EX plants/fungi
- arhopod
-
an aminal with hard outer skeleton, a segmented body and paired joined limbs.
Ex lobster, crabs,spiders - vertebrate
- animals with backbones