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 molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy, without being changed by the reaction.
the inner most layer of the cortex of roots and some stems of plants.
a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.
neurons that transmit nerve impulses away from the central nervous system to the effectors.
three pairs of exocrine glands which secrete saliva into the mouth.
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.