Why are sponges Animals, but colonial choanoflagellates not?

Subject: Why are sponges Animals, but colonial choanoflagellates not?

Date: Fri Mar 11 03:06:32 2011
Posted by Ann
Grade level: undergrad School: No school entered.
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Area of science: Evolution
ID: 1299837992.Ev

Message:


Sponges supposedly evolved from (something like) colonial choanoflagellates, 
which are not animals. What properties did the evolving sponges have to 
acquire to be considered the animal kingdom? Are colonial choanoflagellates 
not considered 'multicellular life'?

Re: Why are sponges Animals, but colonial choanoflagellates not?

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