Rhiannon Twells. :When food enters your mouth we must first of course chew it !!! :Then your back teeth (Molars) mash it down so its easier to swallow.
Chapter 17 Chapter Review Choose the appropriate option. Q. The mechanical and chemical breakdown of foods for use by the bodys cells is called _____.
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Slideshow B4: The skin and liver. The kidneys and the lungs Discussion questions: What is excretion? What do the kidneys do? What is the main waste in.
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