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specialised cells which secrete mucus, usually found together with columnar epithelium and ciliated epithelium.
single-celled floating algae, which provide food for marine animals, such as fish and whales....
the cell organelle responsible for manufacturing and transporting protein and lipids.
organisms whose cells have a true nucleus and true organelles. These structures are not...
non-indigenous species which reproduce and spread more rapidly than indigenous species. This...
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.