Classification of Aliens Background: How do we know that all organisms are related to one another? Scientists have devised a way to show
how organisms are related by their similar characteristics. Grouping organisms by similar characteristics is called
classification. Scientists group organisms into groups that flow from broad, general characteristics to specific
characteristics. These groups are called "The Seven Levels of Classification." As one proceeds through these levels of
classification, the groups become smaller and more specific. These levels are Kingdom, Phylum, Class, Order, Family,
Genus and Species.
What is the mnemonic device that helps us remember these levels?
Objective: Classify using a dichotomous key and the levels of classification
Directions:
1. Use the dichotomous key on the back to classify the pictures of aliens. Write the letter that represents each
alien on the line under its picture.
2. When all the aliens are named, classify out the aliens into the classification system by listing the alien's letters
into the groups below.
Letters that
Letters that
represent the
represent the
aliens
aliens
Kingdom Feet
Kingdom No-Feet
Phylum Socks
Phylum No-Socks
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