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a very long time span in the Earth's history, covering tens or hundreds of millions of years.
the right and left halves of bilaterally symmetrical organisms are mirror images of each other...
the digestive tract of an animal, made up of different organs, that extends from the mouth to...
the acidic fluid secreted into the mammalian stomach which contains various digestive enzymes...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...