The epiglottis - a flap of elastic tissue that projects upwards behind the tongue and hyoid bone. It closes off the larynx during deglutition (swallowing) to prevent aspiration and direct food down the oesophagus rather than the trachea.
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In photosynthesis, water, carbon dioxide, and energy in the form of sunlight are inputs, and the outputs are glucose and oxygen.
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tricuspid valve would be the entrance to the heart