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  Category: Articles » Articles by Author » Author: Evelyn Boichuk
Results 1 - 1 of 1 [1 Pages]  
1.Tingle, Tingle - Where's My Blood?
Circulatory systems occur in all living things, from earth worms to mammals. As humans, our complex system of blood vessels is attached to the blood-pumping heart, which is responsible for keeping the blood flowing in the right directions. We all know we need air to breathe, and that's because ...
[Added: 10 Jan 2007   Hits: 777   Words: 428]