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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.
mostly columnar epithelium with cilia that line the nasal cavity, trachea, bronchi, fallopian...
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
series of interlinked food chains by which energy circulates within an ecosystem.
having similar parts regularly arranged around a central axis.