Search for "indigenous families system"

Displaying 201-220 of 254 results
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Plant Breeding

Plant breeding is an applied science, in which knowledge of genetics, pathology, plant physiology, statistics, and molecular biology are used to modify plant species for human needs or preferences.

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Seashell

Shell is a hard covering made primarily of calcium carbonate, secreted by invertebrate animals (eg, molluscs, barnacles, sea urchins).

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Echinodermata

Echinodermata [Gk "spiny skin"], phylum of exclusively marine invertebrate animals. The 6000 known species occur from shores to greatest depths of all oceans.

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Uranium

Uranium oxide was first identified in 1789 by M.H. Klaproth in the MINERAL pitchblende, but its distinctive property of radioactivity was discovered much later (1896) by Henri Becquerel.

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Asbestos (Mineral)

The name asbestos comes from a Greek word meaning "inextinguishable" (often mistaken to mean "incombustible"). Asbestos is a collective term that is used to designate 2 separate groups of silicates: the serpentine group and the amphibole group.

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Plant Disease

Plant disease can decrease the economic, aesthetic and biological value of all kinds of plants. Plant pathology (phytopathology) is the study of the nature, causes, prevention and socioeconomic aspects of plant diseases.

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Bathurst Island Plant Fossils

Early land plants have long been known from Eastern Canada, thanks to pioneering work by Sir J. William Dawson, father of Devonian palaeobotany and principal of McGill University from 1855 to 1893. But this record poorly represented the earliest phase of land colonization.

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Hurricane

Many factors are involved in their creation. With most, intense sunlight heats the ocean, which in turn warms the overriding air by convection. The heated air rises, carrying away evaporated water charged with energy and producing an area of low pressure.

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Reservoir

Reservoirs, as discussed here, do not include any type of subsurface reservoir structure that stores water, natural gas or oil.

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Cnidaria

Cnidaria, phylum of multicellular, radially symmetrical invertebrates (eg, hydroids, jellyfish, sea anemones, corals) dating to late Precambrian era (630-570 million years ago).

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Montréal Biodôme

Opened in 1992 and located in the former Olympic velodrome, the Montréal Biodôme is part of the “Space for Life” network, which includes Montréal’s Insectarium, Planetarium and Botanical Garden.

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Rabbit Farming

Rabbit farming, officially called cuniculture (from the species name for wild rabbits, Oryctolagus cuniculus), is a small part of Canadian agriculture, with most production in Ontario and Québec.

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Sea Lion

  The northern sea lion, also called the Steller sea lion (Eumetopias jubatus), is the largest of the eared SEALS.

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Animal Issues

Anything involving animals that creates public interest and publicity, no matter how briefly it maintains that interest, may be considered an animal issue.

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Endangered Plants in Canada

A species is endangered if there are threats to its survival. Plants are put at risk for several reasons, including: climate change and the loss of natural habitat to cities, agriculture and industry. In Canada, these activities threaten entire natural ecosystems, such as older forests and Prairie grasslands. As of 2021, 250 plant species are at risk in Canada, according to the Committee on the Status of Endangered Wildlife in Canada. In addition, four are extirpated and one is extinct. The committee’s definition of a wildlife species includes taxonomic categories as well as geographically distinct populations. For example, the bent spike-rush (Eleocharis geniculate) is included on the list of at risk plant species twice, as there are two different populations, one in British Columbia and one in Ontario, facing different threats to their survival. (See also Endangered Animals in Canada.)

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Beluga Whale

The beluga, or white whale, is a type of toothed whale found in Canada’s Arctic, Hudson Bay and St. Lawrence estuary.

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Forest

Main Forest TypesWorldwide there are 3 main forest types related directly to climatic zones: equatorial- and tropical-region forests, temperate-zone forests, and forests associated with colder climates.