A biologist studies a population of chipmunks. Some of the biologist's
findings are shown.
Years 1 - 20: • The population remains below
125. • Less than half of newborn
chipmunks survive to adulthood. • Competition for food and resources limits population
growth.
Year 21 and beyond: • Ninety percent of newborn
chipmunks survive to adulthood.
• 200 chipmunk increases to over
Supportedwitethedatagutheredbytheboologiationcanbe a
The amount of food in the area decreased, causing more chipmunks to survive to reproductive age.
b
Chipmunks in later generations showed greater genetic diversity than previous generations, allowing for a greater survival rate in later generations.
c
Chipmunks migrated from one country to another country to increase the number of chipmunks in the studied area.
d
Individual chipmunks changed their genetic makeup and became more successful in the environment.
e
The number of predators in the area decreased, so more chipmunks were able to survive.
e
The number of predators in the area decreased, so more chipmunks were able to survive.