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a gland which secretes substances, usually enzymes, through a duct directly to the part of the body where they are needed.
having similar parts regularly arranged around a central axis.
an infection of the skin, caused by a parasitic mould. It causes small, red itchy circles on the...
a special kind of biological identification key which consists of sets of organised pairs of...
gas consisting mainly of methane and carbon dioxide, which is produced as a result of...
organelles that only occur in the green parts of plants. They contain the green pigment...