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Answer: The innermost layer of the small intestine is made up of epithelial cells and contains four layers; mucosa, submucosa, muscle layer, and adventitia.
Answer:
It keeps you fit and being fit is healthier, and being healthy prevents heart disease.
Explanation:
Nitrogen (3%) is found in many organic molecules, including the amino acids that make<span> up proteins, and the nucleic acids that </span>make<span> up DNA. Calcium (1.5%) is the most common mineral in the </span>human body<span> nearly all of </span>it<span> found in bones and teeth.
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Answer:
People with type O- blood are called universal donors because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group.
