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small protrusions on the surface of mammalian teeth (premolars and molars), which help to grind up food.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
all the ecosystems on the Earth, all the species within these ecosystems and the genetic...
chisel-shaped teeth found at the front of the mammalian jaw, used to bite and cut off pieces of...
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...