How Animals Evolved and Are Classified
Animals are multicellular organisms that are heterotrophic and in- gest their food. They have the diplontic life cycle. Typically, they have the power of motion by means of contracting fibers.
It's possible to construct a phylogenetic tree for animals, but this is largely based on a study of today's forms. Type of symmetry,
number of tissue layers, type of coelom, and presence or absence of segmentation are criteria that are used in classification.
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