Fossils

oceayen
Mind Map by oceayen, updated more than 1 year ago
oceayen
Created by oceayen about 6 years ago
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Description

9-Li, Ma'am Tenchavez

Resource summary

Fossils
  1. shows
    1. succession of organisms
      1. extinct organisms were different from organisms that exist today
        1. as new species arise, others become extinct
        2. problems
          1. incomplete
            1. organism had to die at right place and time for burial conditions to favor fossilization
              1. rock layer containing fossil had to escape geologic processes that destroy or severely distort rocks
                1. chance that someone will find a fossil is remote
                  1. fossil record is slanted in favor of species that
                    1. have existed for a long time
                      1. were abundant
                        1. widespread
                          1. had hard shells or skeletons
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