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a connected network of vessels and glands, which carry lymph throughout the body.
small groups of cells found in the pancreas that secrete the hormones insulin and glucagon.
an allergic reaction that triggers the immune system causing constriction and inflammation of...
non-indigenous species which reproduce and spread more rapidly than indigenous species. This...
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...