Lesson: Digestive System. Science Differentiation in action All living things are made up of cells. Food has to be broken down before it is transported.
Blood
The Human Body Circulatory and Respiratory Systems 4 th Grade Science.
BLOOD BY ALEXANDRA BROWN. Blood consists of two main components. 1. Plasma, a clear extracellular fluid 2. Formed elements which are erythrocytes, leukocytes.
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