<span>Four laws or principles are involved with the study of stratigraphy. They are </span><span>law of original horizontality, </span><span>law of superposition, law of original lateral continuity, and </span>law of cross-cutting relationships
<span>A rhabdomyoma is a medical term for a benign tumor composed of striated muscle. It is rare, but when it does occur, the most common location is the heart. It can metastasize to other locations in the body, such as the uterus or bladder.</span>
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These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils. Pathogenic (disease-causing) microorganisms must make it past this first line of defence. If this defence is broken, the second line of defence within your body is activated.
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