Subject: Which came first--the lymph system or the blood vessels?
Date: Fri Dec 22 21:52:39 2000
Posted by Shelley Schlender
Grade level: teacher/prof
School: Health Educator, Boulder Valley Schools
City: Boulder State/Province: CO
Country: No country entered.
Area of science: Evolution
Or were they combined at one point and branched apart simultaneously? Is
there any creature where the two systems are intertwined, or is it just
the silliest thing to think they were once so similar as to be serving the
Re: Which came first--the lymph system or the blood vessels?
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