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What is an Animal? PP410-416

Across
An organism's structure
Animals without a backbone
There is just 1 line that divides in into halves that are mirror images
The study of functions in organisms
Down
Biologists have classified animals into about 35 major groups, each of which is called a
A balanced arrangement of body parts that is characteristic of many animals
Animals with a backbone
Has many lines of symmetry that divide it into 2 identical halves.