Discrete or Continuous?

Hair color

http://www.logona.co.uk/media/folio4/Logona_HairColor_Chart.jpg

Light Intensity

http://leisure.prior-it.co.uk/images/Uplight1.jpg

Gender

http://www.flatrock.org.nz/topics/society_culture/assets/gender.jpg

Age

http://www.rah.sa.gov.au/nucmed/images/aging.gif

http://atlas.nrcan.gc.ca/sitefrancais/english/learningresources/carto_corner/ordinal.gif

Fertilizer Concentration

http://www.noble.org/Ag/Economics/FertilizeOrNot/index.htm

Species of Animal

http://www.baby-planet.com/images/end_species.jpg

Time

http://freekick.wordpress.com/2007/01/

http://atlas.nrcan.gc.ca/sitefrancais/english/learningresources/carto_corner/ordinal.gif

Body Size

http://cber.bio.waikato.ac.nz/images/Hikutaia_Cut_fish_600p.jpg

Types of plant in a marsh

http://www.dcr.virginia.gov/natural_heritage/images/EIb_photo1_500.JPG

Average number of Phragmites in a Quadrat