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Q. Is the epithelium vascularized? How do oxygen and nutrients reach the epithelium? Why is this feature an important evolutionary acquisition?
Epithelia are not vascularized capillaries don't directly reach their cells the epithelium exchanges substances by diffusion with the connective tissue situated under it.
Since the epithelia are not vascularized minuscule scratches or skin injuries that happen all the time do not trigger bleeding and do not expose the blood to contamination from external agents this is an important protective strategy discovered by evolution.
how energy enters and then flows through a biological system
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Q. How does the quantity of genetic material differ within the cell during the sequential phases of the cell cycle? The first period of the first phase interphase of the cell c
what steps can you take in order to assess why your cattle are not drinking enough water
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