Natural Selection Population Graphs                             Name ________________________

 

Read each situation. Answer the questions and graph the data given. Be sure to include units and titles.

 

1. The gray squirrels in Oregon have always survived by eating acorns and nuts from the trees in the forest. However, last year a terrible disease caused the trees that produce acorns and nuts to die off. The chart below shows how many squirrels survived each month. Use this information to make a line graph.

 

 

Month	# of Surviving Squirrels
January	500
March	460
May	350
August	250
October	120
December	40

 

 

600

 

500

 

400

 

300

 

200

 

100

 

0          Jan                   Mar                  May                 Aug                  Oct                  Dec

 

 

 

 

 

a. Explain  what is happening to the population of gray squirrels.

 

 

 

 

 

b. What variation might help this population survive?