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a tough substance made from a modified polysaccharide that contains nitrogen. It is the main component of the exoskeletons of arthropods, the cell walls of fungi, the radula's of molluscs and the beaks of cephalopods.
self-feeding; makes its own food by the process of photosynthesis.
is a form of malnutrition where too many nutrients are taken in relative to the amounts required...
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...
a species that helps scientists identify the age of sedimentary rocks.