Similarities among organisms are found in internal anatomical features,
which can be used to infer the degree of relatedness among organisms. In
classifying organisms, biologists consider details of internal and external
structures to be more important than behavior or general appearance.
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Life Science: Diversity and adaptations of organisms Grades 5-8, page 158 Millions of species of animals, plants, and micro-organisms are alive today. Although different species might look dissimilar, the unity among organisms becomes apparent from an analysis of internal structures, the similarity of their chemical processes, and the evidence of common ancestry. NSES Content Standard C
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