Biology Lecture, Ch 25 vocab
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- the preserved remains of ancient organisms
- they can tell a great deal about body forms of organisms that lived long ago
- rocks formed by the accumulation of grains on the bottom of bodies of water
- if undisturbed, the oldest layer (strata) lies at the bottom while the newer at the top
a layer of sedimentary rock
a successive time interval in which half the remaining radioactive material of the radioisotope decays and becomes a different more stable isotope
- a method that relates the ages of rocks to patterns of Earth's magnetism (this changes over time)
- rocks preserve magnetic fields
the study of the movement of major land masses
the movement of lithospheric plates and the continents they contain
- caused by changing physical parameters
- when a large proportion of a species that are living at the time disappear.
an assemblage of all organisms of all kinds living at a particular time or place
all the plants living at a particular time or place
all of the animals living at a particular time or place
- 3 billion years ago
- shallow seas became populated with life
- life = microscopic prokaryotes (eukaryotes evolved 1/2 way through
- a rapid diversification of life
- happened before cambrian period
- vertebrates with well protected eggs that can be laid in dry places
- resulted from split of the terrestrial vertebrate lineage
A supercontinent created from all the continents that exists today being connected.
- Pangea divided into 2 and created this and Gondwana
- This was the northern half
- the other half that resulted from Pangea splitting into 2
- this is the southern half
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