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specialised cells which secrete mucus, usually found together with columnar epithelium and ciliated epithelium.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
the practice and science of classification. This is the part of systematics that is only...
the process whereby water and small molecules dissolved in the blood are forced out of the...