What are villi? blood cells blood vessel connectors bacteria nutrients?

Food provides molecules that serve as fuel and building material for all organisms. plants undergo photosynthesis and make their own food. other organisms, like us and the horse seen above, are consumers and eat food. how do all organisms use food as fuel? be sure to include the name of the process in your answer. me.

Name the organs of humanelemintary canal.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?