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Adaptation
- any characteristic of an organism which helps them survive their environment; natural selection tends to establish adaptations in a population
- Adaptive radiation
- evolution from a common ancestor to a number of different species due to adaptation to new environments
Agnatha
- class of vertebrates represented in Saskatchewan by the Chestnut Lamprey; aquatic, jawless, absence of paired fins
Algae
- simple, photosynthetic plants; lack vascular tissue (roots, stems, leaves) and require water for reproduction
- Anal fin
- an unpaired fin; located on the underside along the middle and after the anus
Analogous
- an organ or structure of one species is said to be analogous to an organ or structure of another organism when both structures have the same function; analogous structures do not necessarily indicate a close relationship between the organisms being compared but an adaptation to similar conditions... for example, the fins of a fish are analogous to the fins of a whale
Anatomic
- structural characteristics of an organism
Annelida
- ringed or segmented worms (earthworms, leeches)
Anterior
- the front end of a bilaterally symmetrical organism
Aorta
- main vessel (artery) carrying blood away from the heart and to the body
Aquaculture
- the farming of fish; aqua = water ; culture= to grow
Artery
- smooth muscle, thick-walled blood vessel which carries blood from the heart towards the body
Arthropod
- a member of a phylum of invertebrate animals; segmented body and limbs and presence of an exoskeleton
Auditory organ
- sense-organ for detecting sound
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