Classification of animals | Animal kingdom | Biology | Khan Academy

Here we delve into some criteria used to classify animals - levels of organization, symmetry, the number of tissue layers, and coelom, and have a quick overview of the different animal phyla.

00:00 Introduction
01:49 Cellular level of organization
02:41 Bilateral and radial symmetry
04:24 Phyla with radial symmetry
05:41 Diploblastic and triploblastic animals
07:38 Acoelomates
08:43 Pseudocoelomates
10:43 Coelomates
13:49 Summary


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