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​Vegetation regions are geographical areas characterized by distinct plant communities.

The salmon is a family of fish, Salmonidae [Lat salire, "to leap"], with soft fin rays, a short dorsal fin, an adipose (fatty) fin, and teeth in the jaws.

The shearwater (order Procellariiformes, family Procellariidae) is a medium-sized seabird.

Rutabaga (Brassica napus, Napobrassica Group), herbaceous biennial vegetable belonging to the Cruciferae family and grown as a root crop in all provinces.

Rhubarb (genus Rheum) is a common name for about 50 species of cool-season herbaceous perennial plants belonging to the buckwheat family and originating in central Asia.

Natural-resource development has played a major role in Canada's economy and continues to be a focus of national concerns.

The greatest variety of native sagebrushes occurs in the western mountains, where species that range from Alaska to California and Colorado are found. Several species range across the prairies and 2 species are transcontinental in Canada. Sagebrushes grow on dry plains, hills and rocky slopes.

Shooting Star (genus Dodecatheon) is a perennial herbaceous plant of Primulaceae family (primrose).

Sand and gravel are unconsolidated, granular mineral materials produced by the natural disintegration of rock caused by weathering. The terms sand, gravel, clay and silt relate to grain size rather than composition. Sand is material passing through a number 4 (4.

Slug is a common name for several terrestrial pulmonate and numerous marine gilled species of gastropod molluscs conspicuous by the lack of an exposed shell.

Thrips, order Thysanoptera (Gk for "fringe-wings"), are among the smallest insects, being slender and usually less than 2 mm long.

Acid rain is the wet or dry deposition of acidic substances and their precursors on the Earth's surface. The ongoing industrialization of society has resulted in the increased release of acidic chemicals into the atmosphere.

The tanager (Thraupidae) is a family of small songbirds, possibly comprising as many as 413 species.

The sturgeon is a large, primitive, bony fish of class Actinopterygii, family Acipenseridae. The 4 genera and 24 species live in fresh and coastal waters of the Northern Hemisphere.

Tungsten (W), also called Wolfram, lapis ponderosus or Heavy Stone, is a silver-grey metallic element with the highest melting point of any metal (3410° C). Tungsten has a high density, high strength at elevated temperatures and extreme hardness.

Unlike other mountainous countries such as Switzerland, and despite its size, Canada is not distinguished by well-known tunnels.

Shrimp are decapods ("10-footed") crustacean, differing from other decapods in being adapted for swimming, a fact reflected in the large, laterally compressed abdomen and well-developed pairs of swimming legs.

Sea Urchin, radially symmetrical marine invertebrate. Sea urchins and near relatives, the sand dollars and heart urchins, belong to class Echinoidea of phylum Echinodermata.

Seabirds are those bird species which spend long periods away from land and obtain all or most of their food from the sea while flying, swimming or diving, and occupy all of the world's oceans.

Sponge (Porifera), phylum of bottom-dwelling, attached, aquatic organisms which, as adults, generate vigorous water currents through their porous bodies by action of internal fields of microscopic flagella (whiplike structures).