Biology 121 - Usask |235 Exam Questions And Answers

endemic species - ️️live in only one or a very small number of places (eg island or lake) cosmopolitan species - ️️species that occur in most regions of the world Galapagos island - ️️- Many endemic species - 500 spp. of vascular plants are endemic -92% of species of land birds are endemic - 26% of marine birds are endemic Biological adaptation - ️️an anatomical structure, physiological process or behavioural trait of an organism that has evolved over a period of time by the process of natural selection such that it increases the expected long-term reproductive success of the organism Marine Iguana (spends part of time in sea) - ️️evolved: - laterally flattened tails for swimming - powerful limbs with strong claws (hold onto rocks) - blunt noses for grazing on seaweed Blue-footed booby (adapted for diving) - ️️- streamline shape, large tail, nostrils that close - Large webbed feet propel bird through water at high speeds - specialized salt-secreting glands manage salt intake while at sea - uropygial gland (waterproofing) Greater frigates (adapted for aerial life) - ️️- highest ratio of wingspan/weight