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the teeth found at the back of the mammalian jaw. In herbivores they have broad surfaces and cusps for grinding plant material.
animals that lack a cavity between the digestive tract and the outer body wall.
the inner most layer of the cortex of roots and some stems of plants.
an infectious disease that is widespread in tropical and subtropical parts of the world and is...
a kingdom of very small, single-celled organisms without a nucleus. They reproduce asexually by...