Chapter 12:History of Life on Earth

15 terms by VivienDollesin 

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Radiometric dating

The estimation of the age of an object by measuring its content of certain radioactive isotopes

Radioisotopes

Charged particles (radiation)

Half-Life

The time required for half of a sample of radioactive substance to disintegrate by radioactive decay or by natural processes

Microspheres

Short chains of amino acids can gather into tiny water droplets

Fossil

The preserved or mineralized remains (bone, tooth, or shell) or imprint of an organism that lived long ago

Cyanobacteria

Photosynthetic prokaryotes

Eubacteria

Prokaryotes that contain a chemical called peptidoglycan in their cell walls

Archaebacteria

Prokaryotes that lack peptidoglycan in their cell walls and have unique lipids in their cell membranes

Endosymbiosis

The theory that mitochondria are descendants of symbiotic, aerobic (oxygen-requiring) eubacteria and chloroplasts are descendents of symbiotic, photosynthetic eubacteria

Protists

Make up a large, varied group that includes both multicellular and unicellular organisms

Extinction

The death of all members of a species

Mass extinction

And episode during which large numbers of species become extinct

Mycorrhizae

Symbiotic associations between fungi and the roots of plants

Arthropod

A kind of animal with a hard outer skeleton, a segmented body, and paired, jointed limbs

Continental drift

The movement of Earth's land masses over Earth's surface through geologic time

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