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fossil_record_week_6_discussion.pdf
living_organisms_week_6_discussion.pdf
question.pdf
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Fossil Record
Living Organisms
Download the attached file labeled “Living Organisms” by clicking on this link: Living
Organisms (ATTACHED) There you will find fourteen (14) imaginary organisms. You will be
classifying these organisms based upon their physical characteristics. First you will need to
decide if all of the organisms represent individual species. Then you will need to group your
species into genera (plural for genus) using the criteria that members of a genus should resemble
each other more closely than they resemble members of other genera. Using the same
criteria, genera are combined into families, and families into orders. Justify your selections by
explaining why certain characteristics were the basis for grouping together while other
characteristics were the basis for separate grouping. It is recommended that you cut out each
organism so that you can move them around next to each other to compare physical
characteristics.
You can use a chart or any other means of showing your classification scheme.
Once you’ve created your classification scheme, download the attached file labeled “Fossil
Record” by clicking on this link. Fossil Record (ATTACHED) Each organism represents a fossil
that has been dated to be a certain number of million years old. These fossils represent ancestors
of the living organisms. You are to determine the oldest ancestor for each genus of organisms
that you’ve identified that is not an ancestor for any other genus. Justify your selections by
explaining why certain characteristics guided you to select one ancestor over another for a
specific genus. Many different genera have common ancestors but often due to evolution, there
is branching within the family tree so that members of the same genus will have a common
ancestor not shared by other genera. It is also recommended that you cut out each organism so
that you move them around to be able to compare them to other organisms and so that you can
order them by age.
HINTS:
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Some living forms are also found in the fossil record.
There are gaps in the fossil record for some lineages.
Some species went extinct without leaving any descendants (remember the dinosaurs).
The organisms were numbered at random; the numbers themselves provide no clues to
evolutionary relationships.
Organism #73, dated to 19 million years old, is the common ancestor for all of the fossils
and the living organisms; therefore, it cannot be one of the ancestors that you identify as
the oldest ancestor for any genus.
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