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Scavenger: Animal that eats decaying flesh.

Sea anemone: A small sea animal with long, thin, armlike body parts called tentacles, which looks much like a flower.

Second-growth forest: Forest that grows naturally after cutting or a fire.

Seep: A spot where water has oozed to the ground surface and formed a pool.

Setae (sing. seta): Hair-like structures on the arthropod ex-oskeleton.

Silt: Fine, tiny specks of earth that settle out of water or fall to the bottom; also, soil material containing very fine particles of rock.

Span: The spread, or distance between two limits, such as the ends of an insect's unfolded wings.

Species: A group of animals that share many traits and can mate and produce young with one another.

Spawn: To produce or release eggs.

Sperm: The reproductive cells that are made by male animals and that fertilize the eggs of female animals.

Spiracles: Breathing holes on the bodies of many arthropods.

Stationary: Unmoving, fixed in position.

Subphyla (sing. subphylum): The major subdivisions of a phylum.

Subtropics: Regions that border on the tropics.

Suture: A thread, wire, or something similar used to close a wound.

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