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small protrusions on the surface of mammalian teeth (premolars and molars), which help to grind up food.
the blood circuit from the heart to the body and back to the heart.
an endocrine gland attached to the base of the hypothalamus, which secretes hormones that play a...
outgrowths that transmit nerve impulses away from the cell body of a neuron.
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...