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1 Describing animals that live permanently attached to a surface, i.e. sedentary animals. Many marine animals, e.g. sea anemones and limpets, are sessile.

2 Describing any organ that does not possess a stalk where one might be expected. For example, the leaves of the oak (Quercus robur) are attached directly to the twigs.

Subjects: Biological Sciences — Environmental Science.

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