Why is the stem of a plant, called two way traffic
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Almost every plant has a stem and roots. It is called 2 way traffic because of 2 functions :
1. Transport food from leaves to roots
2. Transport water and nutrients from roots to plant
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One of the differences between normal stem cells and cancer stem cells is their degree of dependence on the stem cell niche, a specialized microenvironment in which stem cells reside.
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