Jiliam
Jiliam asks:
Q:

Why do the smallest classification groups have organisms with more similarities than the larger ones?

In Topics: Science fair
> 60 days ago

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Expert

greenprof2
Oct 11, 2012
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What the Expert Says:

That is the whole scheme of classification, getting narrower and narrower groupings. Large groups, like phyla, are classified according to criteria like the type of symmetry, body plan, and presence of segmentation. Sponges (Porifera), for example, have a primitive cellular level of organization and lack tissues and symmetry. As you go through the levels of classification you get to finer and finer criteria for shared characteristics, with the finest level being species -- organisms that can interbreed.
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