Links[1] https://www.uoguelph.ca/ib/system/files/BIOL_1500_DE01_W23_9219.pdf [2] https://www.uoguelph.ca/ib/taxonomy/term/173 [3] https://www.uoguelph.ca/ib/taxonomy/term/9 [4] https://www.uoguelph.ca/ib/taxonomy/term/17