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TopicsAlgae are a group of photosynthetic plants that are mostly aquatic. Within the group there is a great variety of size and structure from the single-celled Chlamydomonas to the giant seaweeds. Earthworms The phylum Annelida (segmented worms) is examined in this article. Flatworms The phylum Platyhelminthes is analysed in this article. Free living flatworm (degesia), parasitic fluke (liver fluke) and parisitic tapeworm are the three classes of flatworm. Enzymes An enzyme is a protein and a biological catalyst. Five experiments looking at enzyme activity are outlined. Skeleton and Muscles The structure of the human skeleton is made up of the axial skeleton and the appendicular skeleton. Each part is analysed with descriptions of the joints and muscles which allow movement. DNA and Genes The DNA structure is built up step by step in this article. The Eye The structure of the eye, accomodation, light intensity, binocular vision and eye defects are explained. The Breathing System The parts of the breathing system, the mechanism of breathing, lung capacity, gaseous exchange and a number of experiments connected with breathing are explained. Biology Definitions A-Z A dictionary of biology definitions. |