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animal |
 | | With the advent of electron microscopy and advanced biochemical analyses, intricate differences between simple and microscopic organisms were better understood, and many that were previously fit into the animal or plant kingdom were then placed into separate kingdoms (i.e., Monera for the bacteria, Protista for the algae and protozoans, and so forth). |
| | the animal kingdom has been divided into the three subkingdoms of Parazoa (the sponges), Mezozoa (wormlike parasites), and Eumetazoa. |
| | The chordates include two primitive subphyla of a few species each and the subphylum Vertebrata (see |
| www.factmonster.com /ce6/sci/A0804080.html (392 words) |
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