analyse information from secondary sources to prepare a case study to show how an environmental change can lead to changes in a species
Starting information: Possible case studies of changes in a species
Changes in physical conditions in the environment
The teeth of kangaroos have been selected in response to changes in physical conditions in Australia over the last 25 million years.
Changes in chemical conditions
Chemicals, such as dieldrin and organophosphates, have been used extensively to control the sheep blowfly, Lucilia cuprina. Genetic resistance has occurred within the fly population in response to these chemicals.
Competition for resources
Some species of fruit fly have evolved into different species with each confined to a different type of fruit tree.