[Re:] types of organization
mcall at SUPERAJE.COM
Sun Feb 6 09:21:07 CST 2000
"Prof. Dov Por" wrote:
> You are right in your criticism. One-celled beings are not organisms. I
> have been used to know that there are three
> levels:cell-tissue-organism.Organisms for instance have an embryology
> which the unicells do not have. Organisms are complex structures in which
> many different cells participate.
What is a fertilized human egg? How many cells/tissues does the developing
embryo have to have before it becomes an organism?
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