Struggling with your prescribed literature?
Our Literature Study Guides provide insights and analysis of themes and characters and includes guidelines for writing your exam.
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.
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
an infectious disease that is widespread in tropical and subtropical parts of the world and is...
the loss of water vapour from the aerial parts of a plant through stomata or lenticels.
the movement of an organism in response to a one-directional source of light when the stimulus...